On 9/5/2016 10:05 PM, Mike Perkins wrote:
On 05/09/2016 21:21, newshound wrote:
On 9/5/2016 6:51 PM, Mike Perkins wrote:
On 05/09/2016 16:22, Mike Perkins wrote:
I'm trying to source a steel disk of 50mm or slightly greater where I
can weld a nut in the centre and retains an element of rigidity.

I'm currently using:

http://www.screwfix.com/p/deta-galva...ck-of-10/1946j





really its too large a diameter though not a serious issue but is too
thin where it distorts badly whilst welding a nut in the centre.

Are there any off-the-shelf sources I can obtain a couple of these that
are 2-3mm thick? I've run out of ideas!

Thanks for the ideas.

Going for a 1.5mm thick washer M10 x 50mm and a rivnut from eBay.

Sounds good. Avoid the cheaper type of "pliers" setting tools. If you
don't want to buy an expensive, high quality setting tool because you
are only doing a limited number of parts, just use some studding and
nuts with a length of stout tubing as a spacer. You don't want to be
rotating a thread in the nut which you are setting, you want to be
*pulling* it via a nut on the other end of the studding. A bit of moly
grease on the studding will help. You will want an anti-rotate feature
for the jacking stud, an easy way is a pair of nuts locked together at
one end.

So your sequence of parts is

Rivnut, washer, studding, spacer, jacking nut, two nuts locked together.

I get the principle, thanks. Rather than two locked nuts, wouldn't a
bolt-head be better?

Yes, that would be fine, but if you are doing a number of them, after
the screw nut location has become a bit worn you will need a new bolt.
Whereas with a length of studding, you just cut off that bit and move
along a bit.

I find with 6, 8, 10, and 12 mm studding plus nuts and washers I can
make pullers to do all sorts of things, but I never seem to have quite
the right sort of bolt to hand.

A merit of using a proper bolt (hex or socket head) is that these are
available in "high tensile" materials which are significantly stronger
than ordinary studding, so the threads are a bit more robust.