On 26/08/2020 14:45, Chris Green wrote:
Mike McLeod wrote:
Being unable to obtain one without pre-ordering locally, I've cobbled
up this slide hammer to pull out a ding in the underside of this car I
bought. Some clod had missed the jacking point and ended up pushing up
the floor close to the cross-member the J.P. is mounted to. The
sliding weight should have more than enough grunt to get it out, but
I'm wondering if my scheme will work because I plan to 'weld' the end
of the shaft to the indented part by passing up to 220 amps through it
and thrusting it up against the floorpan, hoping it will stick
sufficiently for me to be able to tap the ding out. I'll turn the
current off as soon as it tacks to the floor, obviously; should only
take a fraction of a second?
I'll be attaching the live cable of an arc welder to the ring-end of
the shaft. The pointy end is shaved down to a flat point of 5mm
diameter. This'll be the part that I hope will fasten itself to the
bottom of the floorpan.

https://yandex.com/collections/card/...6dddf69f0fa62/

Any tips/suggestions as to how to make this idea work most
effectively?

I think it's much more likely that you will simply burn a hole in the
floorpan, it's very difficult to arc weld thin steel.

I think you'd be better off screwing a plate to the floorpan with
several self tapping screws and attaching the slide hammer to that in
some way.


Dent pulling for thin body panels uses hot melt glue and attachments to
the slide hammer with different surface areas. Sprayed IPA will release
the glue from the panel. I've got very limited experience of this
technique and it is not just pulling out a dent but also knocking back
high points (ridge lines etc.). In the OP case cosmetic perfection may
not be required on the underside of a car.

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