On Sun, 13 May 2018 12:25:46 +0100, T i m wrote:


Should we use the special tool (again, production speeds aren't an
issue here) or can a simple bolt and back nut and a thrust bearing or
some washers provide the same effect?

I recently helped someone doing a lot of rivnut fixings on a frame
assembly . The tool used was from Memfast
http://www.memfast.co.uk/shop/Vcat1.asp?cat=2250003430

Tool was about £150 with a complete set of mandrels but worked very
well including for 10mm steel rivnuts (although 10mm were moderately
hard work).

We started by trying to use a fairly cheap pop rivet type tool but the
results were poor with some of the set nuts rotating. It was
difficult to hold the tool perpendicular to the workpiece while
applying the large force bigger nutserts required to set them. The
Memfast tool produced no failures and was easy to use.