Plug Gages and Tapered Holes - Compensation for Heat Treat Distortion

L

Lab Geezer

#1
We have small gears that we bore with a tapered bore (.001 taper) to try to compensate for heat treat distortion and they have to be 100% checked at the machine. We are using a regular Go / No-Go plug gage and have a lot of problems. It is very hard to check a tapered hole with a regular plug gage but I can see no way to use a tapered gage. I think the problem may be from the size of Go / No-Go sectors of the gage. Any thought or suggestions would be appreciated. We machine these parts by the thousands and can not put much extra time int the process,

Thanks in advance :frust:
 
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M

Markaich

#2
on Re: Plug Gages and Tapered Holes - Compensation for Heat Treat Distortion

In the past I have found that trying to compensate for heat changes is very hit and miss. I took to gauging off-line after a period of time to let the parts settle to ambient temperature.

I have also had experiences where increasing process time to allow settling has in fact Inceased output as there were fewer failure. In one case, a cycle time increase of around 5% netted a throughput increase of 13% so do not discount cycle time increases.

Experiment with the process to achieve the optimum...it will be worth it.

Hope this helps
M
 
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