Inspecting ID features with plaster?

[Chipmakr]

I have some ID groove features to check that I cant reach with what I have here. I have seen people use some sort of cast in this situation before and then measure it on a comparator. What do you guys use? Is there any release agent or shrinkage to take into consideration?

 

TIA

[Matt Berube at Ferron Mold]

We use this stuff pretty regularly here. Works great. I don't think it shrinks at all and there is no release agent needed.

 

http://www.flexbar.c...KIT-10p4584.htm

[Matthew Hajicek - Singularity]

Yup, that's the stuff. Works well.

[Chipmakr]

Thanks guys. I will have some on the way today.

[scooke4073]

I use Repo rubber. Works like a charm.

 

http://www.flexbar.c...oRubber-d10.htm

 

 

*EDIT*- Sorry, didn't see the previous post from Matt. Same stuff.

[mx247]

Wish I had know about that stuff a few years ago. We had a job with small ID grooves and the only way we could inspect them was to cut every fifth part or so in half and check them on a comparator.

[Newbeeee™]

We use a dental wax - heat it up slightly with a lighter and it goes soft so you can manipulate it and push it in to get a form.

Wait a few secs and it cools and you can then get a measurement on the optical.

Re-use again for the next and next and next job etc.

I'll look at the make tomorrow at work and post back.

[Chipmakr]

We ordered this:

 

http://www.flexbar.com/shop/pc/viewPrd.asp?idproduct=4666

 

It worked like a champ! Pulled the parts out of the ultrasonic cleaner and they were pretty warm too the touch. This stuff was setup & ready to measure on the comparator in 5 minutes. ( My tolerances were loose so the extra heat was of consequence. Just needed to know we were right before we ran the entire lot of parts.)

 

Thanks for the suggestion guys.