Wedg1e
They call me Mr. Bodge-angles
- Messages
- 7,739
- Location
- Teesside, England
You'll be making @doubleboost jealous with talk like that
I've heard he likes to bash a cucumber about a bit, when the wife isn't looking
You'll be making @doubleboost jealous with talk like that
Jesus, Ronan, don't use the L-word and 'granite surface plate' in the same sentence, Pete will have a fitI meant to buy a granite surface plate before Puppy dog, but never got around to it. The work i would be using would be lapping gasket faces and general marking out with the height gauge. Surprisingly i priced a granite plate at one of the metrology places here and it was surprisingly cheap for a decent brand .
Jesus, Ronan, don't use the L-word and 'granite surface plate' in the same sentence, Pete will have a fit
Yes, i know, but the way i have done it in the past is not by applying abrasive directly to the plate and lapping the surface that way, but by sticking sheets of wet and dry to it with tape and using it that way. There should be no wear on the plate that way.
I don't do paid scraping or rebuilding work.
I will keep an eye out for you.No progress today, eary start and long day tomorrow.
I could do with a larger iron plate to use as a finishing lap if anyone has one. Something like 12" x 18" condition unimportant.
Would I be okay to scrape that small Criterion plate from my big plate?Yeah that needle was swinging about like a VU meter at a rock concert
Nice chatting to you this morning mate. That comparator was showing nearly a half thou dip right under the gauge but it didn't take long to grind out, being so small.
Grade A for your big plate would require better than 3.8um total flatness which it clearly achieved. Attaining grade A isn't too difficult but going one grade better is a lot more challenging especially with my small lapping plate so it didn't make sense to even touch it. A is plenty adequate for general scraping work.
@Pete. , it's about time I invited you to run your gauge over my 6 foot x four foot marking out table - I've no doubt you wouldn't have too much trouble finding it's highs and lows, though it actually doesn't look too bad - I don't think that the cover has been off it since the scraping class the other year!
Yes you can lap cast iron . Where I worked in the last century we had big lapping plates for such workWould I be okay to scrape that small Criterion plate from my big plate?
And, is it possible to lap a cast iron plate and improve its flatness even more than by scraping?