Thread: Hoping to build a grinder.

Originally Posted by drmccubx

... Does anyone know or can send me a link of what compression spring to get for my KMG clone grinder . The build is similar to the PDF on this site ? I was thinking a 1 inch wide by like 6 inch long ? and I guess something fairly strong ?

Die Springs | MSCDirect.com

These are what I replace stock springs with on my Baders.

ok, so here is a sample of progress on my grinder , years after starting. one pic of tooling arm, one of tracking assembly, one of work rest , one of flat platen . All are "in progress" . Tooling arm has to be welded to uprights , platen needs more holes drilled and platen welded on, tracking assembly needs to be welded to tension support . Today i go and get Bolts to hold on the wheels and other parts .

Originally Posted by drmccubx

Today i go and get Bolts to hold on the wheels and other parts .

I'd get some shoes too, while I was out.
Metal slivers suck..

Nice work so far, getting some ideas for an upgrade watching this thread unfold.

yeah, running up and down stairs to work a little here and there makes putting shoes on troublesome . But , alas , i should wear shoes. So, i got some bolts , lock washers , lock nuts . Work rest looks great . Now waiting on steel from local welder for the uprights. Though i do have some 3/8th's inch thick steel i could use . I asked the welder for 3/4 inch thick . Would it make a difference ? Whats everyones take . 3/8ths or 3/4 for uprights to hold tooling arm ? Very few steps to go . Oh , another question . Do people use threaded rod for the wheel axles ? or get long bolts and washers ? Hopefully next week it gets welded up

so here is the tool rest done. You get the idea

here is the vfd and motor. It's getting there

slots made for adjusting platen.

So I guess my question about a spring is what length to get ? Thanks mike for the suggestion. I just don't know if the one you suggest will do . its 3 inch length is short , no ? for a KMG clone that is . I just don't want to guy and have to return . I was told it should compress 1 inch per 30lbs ?

looking good & progressing well mate
also good to see someone who wears the same shed safety shoes as me LOL

Originally Posted by drmccubx

So I guess my question about a spring is what length to get ? Thanks mike for the suggestion. I just don't know if the one you suggest will do . its 3 inch length is short , no ? for a KMG clone that is . I just don't want to guy and have to return . I was told it should compress 1 inch per 30lbs ?

I use a valve spring along with the spring seats on a KMG clone. The spring is much stiffer than 30lbs per inch. I don't think that the rate is very important, though it seems to me that a stiffer spring makes the design easier because the length does not change very much over a range of tensions. I would guess that I use the grinder with about 30-50lbs of tension in the spring.