Mystery Project...

Is that rebound tester a commercial unit, or is it shop-built?
 
BTW: Here are examples of the testers I have. These are just the 1st ones I grabbed pictures of on ebay. Shop around. Both can be had for 1/2 of what these dealers are asking.


Question: If there's any interested in this turret head, I'd be willing to make an additional one and sell it at auction here with 20% of the proceeds going to support this site. Let me know if there's any interest in that -but you'll probably want to see what it looks like first understandably.


Ray

http://www.ebay.com/itm/MILLER-ENGI...203?pt=LH_DefaultDomain_0&hash=item3375d8b003

http://www.ebay.com/itm/Portable-Br...153?pt=LH_DefaultDomain_0&hash=item2a146d84b9
 
BTW: I got an unusual PM from someone about this and some of my other demonstration projects so let me explain... I'm well aware that nothing I'm showing is rocket science and I try to give decent verbal descriptions and show pictures to help some of the folks that are learning this for the 1st time. Some people learn with pictures some folks need written words etc..

Ray

And as one of your target audience I thank you for that Ray

Bernard
 
Ray, I'd like to have a nickel for each PM I got saying I was getting too simple in my explanations. You are correct, not all have seen some of the things we do done before. Keep doing what you are doing and ignore those others. Bang up job on this one I must say.

"Billy G"
 
Thanks, Bill -that means a lot -and I appreciate it.

It was bang-up all right... When I was setting the plate down for the 1st time on top of the shaft in the rotary table, it was a tight fit and suddenly the plate just dropped into position -Right Smack On My Finger! -Finger is still banged up! :bawling:. Man, I can read my pulse by looking at my finger...

Ray




Ray, I'd like to have a nickel for each PM I got saying I was getting too simple in my explanations. You are correct, not all have seen some of the things we do done before. Keep doing what you are doing and ignore those others. Bang up job on this one I must say.

"Billy G"
 
Quick update:

Minor snag today and I had to surface grind the plate after all -but not due to warpage or heat distortion... When I pack carburized this big piece, the foil would not seal well and chunks of the carbon stuck to the surface. Tried scraping, wire wheeling and sandblasting -no luck. Some of it chipped off but other pieces were too stubborn and seeming hard as diamond. In the grinder it went and I took off just enough to get all the bumps off. I checked hardness after the grinding -no difference at all. Naturally it's harder toward the outer diameter and in the areas where the holes were clustered together. In those areas, it's RC 42, in the center RC 32 and at the edge of the center hole, back up to RC 40. I don't know if this is acceptable variance but suspect it's within the realm of acceptable -definately OK for this non-critical part.

There's a big learning curve with this. I've done several smaller parts and measured them precisely before and after treating -there was no measurable difference at all. Wasn't expecting the carburizing material to stick like this; no doubt due to oxygen exposure. Next time I get into a situation of not being able to seal the foil, I'll shoot the oven up with CO2 during the process to see if that helps.

Grinding that big monster is a real chore... Here's the top side.

Hard and Ground.JPG

Ray

Hard and Ground.JPG
 
Well, as consolation, it looks real perty now ;)
 
And here it is with black oxide. Next up, start working on the adjustable pedestal or possibly, make a couple of the holder blocks. Haven't decided which to start with yet. Makes no difference; I'm working from a CAD drawing.

BTW: The black oxide looks splotchy in the photo. It was still drying.

Black Oxide.JPG

Ray

Black Oxide.JPG
 
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