O/T Special Gage Blocks

[chris m]

Any help on this one would be appreciated:

 

I need to have a couple of special gage blocks made to use for setting masters and I'm having a bitch of a time finding somebody to make them.

 

Here's what I need: [1] block 3/4" or 1" square by .3148 thick and [1] block .3940 thick. Blocks need to be Class XX [.00005] precision or better.

 

Starrett quoted a stiff price and long lead time, Mitutoyo was similar....

 

Any experience with this would be helpful

 

C

[mayday]

well Chris,

got anyone around the shop thats used a lapping plate before? I have made some years back. its not that difficult, just takes time and precision and a dam good indicator. infact we made some from ceramic that stuff grinds and laps nice with diamond wheel. just dont drop it

[jimspac]

Chris,

 

A quality tool and gage shop is your best bet. You can try Ely Tool in Springfield, MA and ask for Matt. They do specials on demand for P&W.

[chris m]

MayDay, that ain't gonna fly here, needs to be traceable back to the first humanoid known to measure distance with his foot

 

Jim, thanks, I'll jump right on that and see where it goes

 

C

[Roger Peterson]

http://www.hschmidt.com/

 

 

HTH

[Müřlıń®]

Using the proper tec's, you can hold 50 millionths on a standard surface grinder and get 5 RMS or better with 100-I wheel. All you need is a good tenth indicator(InterRapid) and some Joe Blocks....grind the chuck in with a 46-H/I...

[Andris Skulte]

Chris,

If it just needs a cert, why not make it in house, and have an outside A2LA gauge house certify it? You get your NIST traceable certification, and you don't spend thousands making it

[chip]

Chris

Iscar makes a decent Flycutter. Just make sure the head is trammed in pretty good on the Bridgeport. You should be fine!

 

 

[Kevangel]

I am with Murlin, "I would add", make several at the same time in case you blow one, since they are simple shapes, to save time you can put them on magnetic parrallels to save grinding entire chuck, we hold 50 mill and we are nothing special, using standard Harig grinder. Watch the heat....linear coeffcient of expansion

[Hardmill]

Chris if you send me a sketch I'll show it to

one of our grinders.

quote:

---

if it just needs a cert, why not make it in house, and have an outside A2LA gauge house certify it? You get your NIST traceable certification, and you don't spend thousands making it

---

I would think this would be a good alternative.

 

Some of the best grinders around, I see no problem.

 

 

PEACE

[deeherk]

maybe someone with wire edm can do it for you..

i hear those guys are good!!!

dan

[chris m]

Hardmill, the email's on the way

 

Roger, Schmidt says that's not the business they're in; thanks for the lead, though

 

Jim, I faxed a sketch to Matt at Ely, we'll see what he has to say

 

Thanks

 

C

[CR]

I Know you want precision!

 

Just want to make sure you didn't

fail to notice or consider the metric sizes

 

8mm = 0.3150

10mm = 0.3937

by 24.1 square

 

Just a thought

[chris m]

CR I thought about that but we have a bad history of guys setting the gage to zero when it should be +.0002 or whatever; I'll take the beating of a couple hundred extra bucks now vs $10K in scrap later...

 

Thanks for pointing that out, though, sometimes I CAN get too close to something and miss the obvious.

 

C