bearing clearence

[tevez]

When using lead to check clearences do you measure the thickness of the compressed lead, or the width of the compressed lead.

 

[Tmoose]

The thickness in the actual crushed direction should be close to the real diametral clearance, if the lead's yield strength is real low. For sure I'd like it to be lower than the bearing material I;'m testing.

The product plastigage is "read" by measuring the width, but it is based on a "calibrated" diameter of the original plastic string, and a particular material, and the volume remaining constant pre- and post- squishing. Plastigage is available in a few sizes to cover a ranges of clearance from 0.001 inch to at least 0.009 inch.

http://www.amazon.com/Goodson-Plastigage-Assortment-Pack/dp/B0009RK8R4

The outfit in England claims to be the originator, and has product to measure up to 70 thou.

http://www.plastigaugeusa.com/pricelist.html

 

[geesamand]

I've measured the thickness of the crushed lead with good results.

Plastigage is good stuff but it doesn't work in all applications.

David