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| Science Forum Index » Electronics - Design Forum » Sheet metal knockout punches... |
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Message |
| pimpom... |
 Posted: Sat Oct 31, 2009 1:11 am |
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Guest
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I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend in
the US who's coming for a visit in a few weeks and I want to ask
him to bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they
have the size range I need, but they seem to be sold only in the
UK. I have not been able to find out the identity of the
manufacturers. So, could you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in ordering
such items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They
don't even have to be quite up to Greenlee standard as the
material I work with is mostly 1-2 mm aluminium, with an
occasional 1mm mild steel.
4. Any other suggestions will be appreciated. |
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| John Fields... |
| Posted: Sat Oct 31, 2009 6:39 am |
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Guest
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On Sat, 31 Oct 2009 12:29:20 +0530, "pimpom" <pimpom at (no spam) invalid.com> wrote:
[quote]I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend in
the US who's coming for a visit in a few weeks and I want to ask
him to bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they
have the size range I need, but they seem to be sold only in the
UK. I have not been able to find out the identity of the
manufacturers. So, could you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in ordering
such items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They
don't even have to be quite up to Greenlee standard as the
material I work with is mostly 1-2 mm aluminium, with an
occasional 1mm mild steel.
4. Any other suggestions will be appreciated.
---[/quote]
Greenlee makes what you need; they call them 'standard round knockout
punches' and you can see them on page 53 of their catalog:
http://www.greenlee.com/cat_docs/Holemaking08_lowrez.pdf
They have lots of distributors here in the US (WW Grainger comes to
mind) so your friend should have no trouble finding them.
You may also want to try a step-bit drill; they're pretty handy and less
expensive than an array of punches.
JF |
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| Dave M... |
| Posted: Sat Oct 31, 2009 6:40 am |
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Guest
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pimpom wrote:
[quote]I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend in
the US who's coming for a visit in a few weeks and I want to ask
him to bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they
have the size range I need, but they seem to be sold only in the
UK. I have not been able to find out the identity of the
manufacturers. So, could you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in ordering
such items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They
don't even have to be quite up to Greenlee standard as the
material I work with is mostly 1-2 mm aluminium, with an
occasional 1mm mild steel.
4. Any other suggestions will be appreciated.
[/quote]
Knockout punches are sized for conduit fittings. You want to search for
Chassis Punches. Greenlee is prpbably the best-known maker. If you're
looking for 1-time use, the famous auction site is probably the best place
to start. Item 120484675057 gives you a wide selection, but if you're
looking for specific punch sizes, search for chassis punch at McMaster-Carr
(http://www.mcmaster.com).
--
David
masondg44 at comcast dot net |
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| Martin Riddle... |
| Posted: Sat Oct 31, 2009 7:58 am |
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Guest
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Klein Tools also makes knockout punches.
MSC is another supplier that caries the Greenlee line.
Cheers
"pimpom" <pimpom at (no spam) invalid.com> wrote in message
news:hcgn86$pkh$1 at (no spam) news.albasani.net...
[quote]I'm having a hard time finding knockout punches for making 1/2 - 1"
(say ~12 to 25mm) holes in sheet metal . The smallest size by Greenlee
is for 1/2-inch conduits with an actual hole diameter of 22.4 mm, and
all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend in the
US who's coming for a visit in a few weeks and I want to ask him to
bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they have
the size range I need, but they seem to be sold only in the UK. I have
not been able to find out the identity of the manufacturers. So, could
you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in ordering such
items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They don't
even have to be quite up to Greenlee standard as the material I work
with is mostly 1-2 mm aluminium, with an occasional 1mm mild steel.
4. Any other suggestions will be appreciated.
[/quote] |
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| Michael A. Terrell... |
| Posted: Sat Oct 31, 2009 8:37 am |
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pimpom wrote:
[quote]
I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend in
the US who's coming for a visit in a few weeks and I want to ask
him to bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they
have the size range I need, but they seem to be sold only in the
UK. I have not been able to find out the identity of the
manufacturers. So, could you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in ordering
such items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They
don't even have to be quite up to Greenlee standard as the
material I work with is mostly 1-2 mm aluminium, with an
occasional 1mm mild steel.
4. Any other suggestions will be appreciated.
[/quote]
This is a hand operated metal punch for smaller holes:
<http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=91510>
This is a base to mount it to a workbench:
<http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93787>
They are similar to the more expensive ROPER-WHITNEY METAL PUNCH
Here are some examples of the step drills that John mentioned:
<http://search.harborfreight.com/cpisearch/web/search.do?keyword=step+drill&Submit=Go>
They are great for deburring holes and inside the ends of conduit, as
well.
--
The movie 'Deliverance' isn't a documentary! |
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| Jim Thompson... |
| Posted: Sat Oct 31, 2009 9:47 am |
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On Sat, 31 Oct 2009 07:39:26 -0500, John Fields
<jfields at (no spam) austininstruments.com> wrote:
[quote]On Sat, 31 Oct 2009 12:29:20 +0530, "pimpom" <pimpom at (no spam) invalid.com> wrote:
I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend in
the US who's coming for a visit in a few weeks and I want to ask
him to bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they
have the size range I need, but they seem to be sold only in the
UK. I have not been able to find out the identity of the
manufacturers. So, could you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in ordering
such items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They
don't even have to be quite up to Greenlee standard as the
material I work with is mostly 1-2 mm aluminium, with an
occasional 1mm mild steel.
4. Any other suggestions will be appreciated.
---
Greenlee makes what you need; they call them 'standard round knockout
punches' and you can see them on page 53 of their catalog:
http://www.greenlee.com/cat_docs/Holemaking08_lowrez.pdf
They have lots of distributors here in the US (WW Grainger comes to
mind) so your friend should have no trouble finding them.
You may also want to try a step-bit drill; they're pretty handy and less
expensive than an array of punches.
JF
[/quote]
"Slug-Splitter", eh? That sure would have been nice in my days of
punching holes for toob sockets 
...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
In Memoriam...
Duane Lee Thompson
October 31, 1972 - April 20,2006
4th Child, 2nd Son, of Jim & Naomi Thompson
Victim of Colon Cancer
Would Have been 37 Today |
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| ChrisQ... |
| Posted: Sat Oct 31, 2009 10:37 am |
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Guest
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pimpom wrote:
[quote]I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend in
the US who's coming for a visit in a few weeks and I want to ask
him to bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they
have the size range I need, but they seem to be sold only in the
UK. I have not been able to find out the identity of the
manufacturers. So, could you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in ordering
such items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They
don't even have to be quite up to Greenlee standard as the
material I work with is mostly 1-2 mm aluminium, with an
occasional 1mm mild steel.
4. Any other suggestions will be appreciated.
[/quote]
The Q-Max hole cutters are still being made and last time I looked, they
were stocked by both RS components (rswww.com), Farnell
(www.farnell.co.uk) and others. You can order and pay by card for a
single transaction on many of the sites without registration.
Don't know who owns the Q-max brand now, but they've been the standard
item for such tasks for 50+ years...
Regards,
Chris |
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| Archimedes' Lever... |
| Posted: Sat Oct 31, 2009 10:45 am |
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Guest
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On Sat, 31 Oct 2009 12:29:20 +0530, "pimpom" <pimpom at (no spam) invalid.com> wrote:
[quote]I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
[/quote]
Wrong! The Greenlee 1/2" hole punch PUNCHES 1/2" HOLES!
The 1/2" conduit is what is at 22.4mm. D'OH!
I know this for a fact as I use this exact punch to punch holes in a 4"
wide heavy braid ground strap tab from a 1/4" hole to 1/2" to accommodate
a 1/2" stud on the back of one of our vendors' racks. That 1/2" stud IS
1/2" so I KNOW the Greenlee punch is exactly what they declare it is.
Buy with confidence if 1/2" is what you need.
They also sell D-SUB connector punches, Indexed hole punches, and many
other electronics industry punches, not just electrical wiring industry
stuff. Also, IIRC, they will make a custom punch as well.
They then, of course, make it part of their non-standard line of offered
products. |
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| Archimedes' Lever... |
| Posted: Sat Oct 31, 2009 10:51 am |
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Guest
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On Sat, 31 Oct 2009 12:29:20 +0530, "pimpom" <pimpom at (no spam) invalid.com> wrote:
[quote]I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
[/quote]
You did not look well enough then. Their electrical lines match those
figures, but they do sell other lines...
Look in the catalog for:
Slug-Buster® Knockout Punches 0.492" to 2.520"
It is page 46 of the 31MB pdf catalog. |
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| Archimedes' Lever... |
| Posted: Sat Oct 31, 2009 11:51 am |
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Guest
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On Sat, 31 Oct 2009 23:12:29 +0530, "pimpom" <pimpom at (no spam) invalid.com> wrote:
[quote]I'm still considering the Q-Max punches. Could anyone please
answer the question in my initial post about having them sent to
the US?
[/quote]
Nearly every mid sized and major city has a "Graingers" supply house.
Most have several. They either already have it, or can get it fairly
quickly, so your friend can drive to one, and either grab it or order it
to show up within a week. |
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| pimpom... |
| Posted: Sat Oct 31, 2009 11:54 am |
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Guest
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pimpom wrote:
[quote]I'm having a hard time finding knockout punches for making
1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size
by
Greenlee is for 1/2-inch conduits with an actual hole diameter
of
22.4 mm, and all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend
in
the US who's coming for a visit in a few weeks and I want to
ask
him to bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they
have the size range I need, but they seem to be sold only in
the
UK. I have not been able to find out the identity of the
manufacturers. So, could you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in
ordering
such items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They
don't even have to be quite up to Greenlee standard as the
material I work with is mostly 1-2 mm aluminium, with an
occasional 1mm mild steel.
4. Any other suggestions will be appreciated.
[/quote]
Thanks for all the replies, everyone. I hope you don't mind if I
reply in one post.
I'd already downloaded the pdf catalog suggested by John before I
posted my request, but I was influenced by my failure to find
what I wanted while browsing online (plus a comment by someone in
another newsgroup) and I missed seeing the exact-size punches.
Thanks for pointing it out.
I looked at the step drill bits before but didn't give them much
thought. Now that John and Michael have suggested it, it's
starting to look like a good, relatively inexpensive option.
eBay item 120484675057 suggested by Dave M is exactly what I
want. Let's see if I manage to win it, though it will mean
staying up to 4:00 AM over here. And my ISP has a nasty habit of
going down at any time for indefinite periods on weekends.
at (no spam) Archimedes' Lever: please see my explanation in the second para
above.
I'm still considering the Q-Max punches. Could anyone please
answer the question in my initial post about having them sent to
the US? |
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| ChrisQ... |
| Posted: Sat Oct 31, 2009 11:55 am |
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Guest
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pimpom wrote:
[quote]
I'm still considering the Q-Max punches. Could anyone please
answer the question in my initial post about having them sent to
the US?
[/quote]
Farnell are in the us, so you should be able to buy from them online.
http://www.farnell.com
tools and productions supplies -> hand and woodworking -> punches -> Q-Max
Still pretty low cost as well, surprisingly...
Regards,
Chris |
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| Archimedes' Lever... |
| Posted: Sat Oct 31, 2009 12:12 pm |
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Guest
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On Sat, 31 Oct 2009 17:55:35 +0000, ChrisQ <meru at (no spam) devnull.com> wrote:
[quote]pimpom wrote:
I'm still considering the Q-Max punches. Could anyone please
answer the question in my initial post about having them sent to
the US?
Farnell are in the us, so you should be able to buy from them online.
http://www.farnell.com
tools and productions supplies -> hand and woodworking -> punches -> Q-Max
Still pretty low cost as well, surprisingly...
Regards,
Chris
[/quote]
Good job of NOT answering his question.
He already said that shipping it to him is the hassle.
He is looking to get it into the hands of the buddy that is coming to
see him.
You should actually READ threads at some point to make your
participation a bit more valid.
Yes, Farnell is good, as is Grainger, and basically ANY local electrical
supply outlet. Neary all carry about the same price schedules for these
types of products.
A simple check on ebay will yield expected retail price, if you add
about 10% to 15%.
http://shop.ebay.com/i.html?_nkw=Slug-Buster&_sacat=0&_trksid=p3286.m270.l1313&_odkw=Greenlee+Q&_osacat=0 |
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| Martin Riddle... |
| Posted: Sat Oct 31, 2009 12:17 pm |
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Guest
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"pimpom" <pimpom at (no spam) invalid.com> wrote in message
news:hchsu6$j7l$1 at (no spam) news.albasani.net...
[quote]pimpom wrote:
I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend in
the US who's coming for a visit in a few weeks and I want to ask
him to bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they
have the size range I need, but they seem to be sold only in the
UK. I have not been able to find out the identity of the
manufacturers. So, could you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in ordering
such items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They
don't even have to be quite up to Greenlee standard as the
material I work with is mostly 1-2 mm aluminium, with an
occasional 1mm mild steel.
4. Any other suggestions will be appreciated.
Thanks for all the replies, everyone. I hope you don't mind if I reply
in one post.
I'd already downloaded the pdf catalog suggested by John before I
posted my request, but I was influenced by my failure to find what I
wanted while browsing online (plus a comment by someone in another
newsgroup) and I missed seeing the exact-size punches. Thanks for
pointing it out.
I looked at the step drill bits before but didn't give them much
thought. Now that John and Michael have suggested it, it's starting to
look like a good, relatively inexpensive option.
eBay item 120484675057 suggested by Dave M is exactly what I want.
Let's see if I manage to win it, though it will mean staying up to
4:00 AM over here. And my ISP has a nasty habit of going down at any
time for indefinite periods on weekends.
at (no spam) Archimedes' Lever: please see my explanation in the second para
above.
I'm still considering the Q-Max punches. Could anyone please answer
the question in my initial post about having them sent to the US?
[/quote]
Q-max seems to be a UK item.
<http://www.google.com/search?hl=en&safe=off&rls=com.microsoft%3Aen-us&q=q-max+hole+punches&aq=f&oq=&aqi=>
I would go with the step drill $35 or order a greenlee from MSC. (your
buddys in the US)
<http://www1.mscdirect.com/CGI/GSDRVSM?PACACHE=000000114429845>
MSC delivers in a day or two, As well as Grainger and Mcmaster.
Cheers |
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| Martin Riddle... |
| Posted: Sat Oct 31, 2009 12:46 pm |
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Guest
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"Jim Thompson" <To-Email-Use-The-Envelope-Icon at (no spam) My-Web-Site.com> wrote in
message news:stmoe5prvg2m1hn35ds7qmpj1f8bbtg1ll at (no spam) 4ax.com...
[quote]On Sat, 31 Oct 2009 07:39:26 -0500, John Fields
jfields at (no spam) austininstruments.com> wrote:
On Sat, 31 Oct 2009 12:29:20 +0530, "pimpom" <pimpom at (no spam) invalid.com
wrote:
I'm having a hard time finding knockout punches for making 1/2 -
1" (say ~12 to 25mm) holes in sheet metal . The smallest size by
Greenlee is for 1/2-inch conduits with an actual hole diameter of
22.4 mm, and all other sizes are much too big.
I'm in India where importing anything involves too much hassle,
especially from a remote part of the country. I have a friend in
the US who's coming for a visit in a few weeks and I want to ask
him to bring the punches for me.
Someone in another newsgroup pointed out Q.Max punches and they
have the size range I need, but they seem to be sold only in the
UK. I have not been able to find out the identity of the
manufacturers. So, could you please answer these questions -
1. Who makes Q.Max punches?
2. What kind of hassle and customs duty are involved in ordering
such items from the UK to the US?
3. Are there any sources in the US for the sizes I need? They
don't even have to be quite up to Greenlee standard as the
material I work with is mostly 1-2 mm aluminium, with an
occasional 1mm mild steel.
4. Any other suggestions will be appreciated.
---
Greenlee makes what you need; they call them 'standard round knockout
punches' and you can see them on page 53 of their catalog:
http://www.greenlee.com/cat_docs/Holemaking08_lowrez.pdf
They have lots of distributors here in the US (WW Grainger comes to
mind) so your friend should have no trouble finding them.
You may also want to try a step-bit drill; they're pretty handy and
less
expensive than an array of punches.
JF
"Slug-Splitter", eh? That sure would have been nice in my days of
punching holes for toob sockets ;-)
...Jim Thompson
[/quote]
Their also almost twice the price of a standard knockout.
Cheers |
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