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| Mike Smith... |
 Posted: Thu Nov 05, 2009 7:45 pm |
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Problem: Client of the charity I work for who is working for London
Underground has 'safety' shoes with a hollow grid supporting the heel, the
inner sole or liner deforms over time so the grid digs in and damages the
heel, however the shoes do protect against high voltages.
Possible solutions include cutting blocks from wooden strip (available at
most model shops) and fitting thiese in the voids but that'd be a bit fiddly
and I am not sure they could cut them accurately enough to avoid causing
problems with raised blocks.
I'm in Manchester, 200 miles away, and hence cannot 'pop round' to do the
job.
I happen to have a pair of very cheap 'shoes' to hand which I was throwing
out because of the exact same defect in design, I also have a tube of
acrylic sealant, considering trying squirting same into voids, quoted curing
time 48 hrs.
However I gather this is not waterproof even when cured (cures by
evaporation of water) and hence not sure if this is a good idea inside a
shoe. Also concerned that the quater inch deep rectangular voids would
function pretty much as the tube does and the stuff wouldn't cure, just form
a thick upper skin.
On the plus side its just a question of peeling back the inner liner and
squirting in the goo until it is slightly proud of the top of the grid, then
leave open until cured before replacing the liner.
Anyone know anything about this kind of stuff, I normally use silicone,
bought this stuff at the local 'pound shop' as I was making a model farm for
a kiddie and the acrylic type can be painted. Hence it'll be cheap, low
modulus with a lot of chalk in it (but it is a handy scenic modelling
material).
Any thought/suggestions welcome.
Regards
Mike |
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| Wayne C. Morris... |
| Posted: Sat Nov 07, 2009 1:14 am |
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Guest
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In article <hcvrj4$rlh$1 at (no spam) news.albasani.net>,
"Mike Smith" <mike at (no spam) invalid.invalid> wrote:
Quote: Problem: Client of the charity I work for who is working for London
Underground has 'safety' shoes with a hollow grid supporting the heel, the
inner sole or liner deforms over time so the grid digs in and damages the
heel, however the shoes do protect against high voltages.
My advice: Do NOT attempt to fill the hollow grid with anything. It's a piece
of safety equipment, and altering it might compromise the protection. Some
nonconductive substances aren't effective at high voltages, or under certain
conditions such as when wet.
It *might* be okay to insert a sheet of stiff plastic on top of the grid, but I
wouldn't want to bet my own life on it.
Quote: I happen to have a pair of very cheap 'shoes' to hand which I was throwing
out because of the exact same defect in design, I also have a tube of acrylic
sealant, considering trying squirting same into voids, quoted curing time 48
hrs.
Acrylic or silicone sealers would just form a thick skin, and the stuff
underneath could stay gooey for weeks or months.
If the shoes won't be used for high-voltage protection, I'd just cut new insoles
out of a stiff material like polyethylene from a milk jug, and add padded
insoles for comfort. |
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| Mike Smith... |
| Posted: Sat Nov 07, 2009 2:19 am |
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Guest
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"Wayne C. Morris" <wayne.morris at (no spam) this.is.invalid> wrote in message
news:wayne.morris-BC2F66.00145607112009 at (no spam) newsfarm.iad.highwinds-media.com...
Quote: In article <hcvrj4$rlh$1 at (no spam) news.albasani.net>,
"Mike Smith" <mike at (no spam) invalid.invalid> wrote:
Problem: Client of the charity I work for who is working for London
Underground has 'safety' shoes with a hollow grid supporting the heel,
the
inner sole or liner deforms over time so the grid digs in and damages the
heel, however the shoes do protect against high voltages.
My advice: Do NOT attempt to fill the hollow grid with anything. It's a
piece
of safety equipment, and altering it might compromise the protection.
Some
nonconductive substances aren't effective at high voltages, or under
certain
conditions such as when wet.
It *might* be okay to insert a sheet of stiff plastic on top of the grid,
but I
wouldn't want to bet my own life on it.
I happen to have a pair of very cheap 'shoes' to hand which I was
throwing
out because of the exact same defect in design, I also have a tube of
acrylic
sealant, considering trying squirting same into voids, quoted curing time
48
hrs.
Acrylic or silicone sealers would just form a thick skin, and the stuff
underneath could stay gooey for weeks or months.
If the shoes won't be used for high-voltage protection, I'd just cut new
insoles
out of a stiff material like polyethylene from a milk jug, and add padded
insoles for comfort.
Thanks for the reply - The person in question works in an office, so the
electrical protection is not (hopefully) an issue.
Think you are right about adding some kind of cover though, have been trying
various filler type materials in short lengths of tube and I am getting a
lot that do not fully cure as you suggest (the ones that set solid are
rather expensive to boot).
The acrylic sealant sets by evaporation of water, and apparently doesn't
take too well to damp conditions, so that's out (still handy as a scenic
material though).
I had tried using pretty solid insoles taken from another pair of old shoes
on the ones I am throwing, this worked for a bit but over time they deformed
over the ribs. Personally I will avoid this kind of heel in the future but
it's handy for these experiments.
Might try cutting some sheet metal from an old computer case, we have some
old units with comparatively thick cases (and I doubt we will find a use for
old 486's these days).
Thanks again for taking time to reply, I'll double check the electrical
safety issue.
Just got a kit I have wanted for years, or rather have wanted to kit bash
for years, so my patience with this job may wear a little thin if I do not
solve it in the next couple of days.
Regards
Mike |
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