Collet Help

Yes a metric set works for imperial sizes. Metric collets are numbered for a range in millimeters something like 5-4, 6-5, 7-6, etc. For example, to hold a 3/8ths round piece it would take a 10-9 metric collet.
A 23 collet set should cover any Imperial size up to and including an inch but please calculate it out for yourself to be sure.
 
Tozguy said:
Yes a metric set works for imperial sizes. Metric collets are numbered for a range in millimeters something like 5-4, 6-5, 7-6, etc. For example, to hold a 3/8ths round piece it would take a 10-9 metric collet.
A 23 collet set should cover any Imperial size up to and including an inch but please calculate it out for yourself to be sure.
Click to expand...

Thanks Tozguy for the response. I suppose it is possible the imperial sets are the same as the metric sets with different
labeling. The only reason I mention this is because the 23 piece sets labeled CNC are about half the price of the imperial sets
in most cases as I peruse E-bay......
 
You may be right. I went with the least expensive ER32 metric set and have not looked back.
 
Bolton Group has ER40 collets for under $8.00 ea. If you buy one, shipping doubles that, but buy a bunch and its' about the same shipping.
 
I have seen posts that say ER collets are more difficult to use at the extent of their range, fully tightened, that they require much more torque there to hold well. I have no experience with ER collets, just asking.
 
You can get ER collet chucks to fit nearly anything. I have ER 16 and 32 with .750 straight shanks and use them in the mill and lathe to hold smaller parts and cutters, they have a wider grip range and run truer than 5C or R8 collets. The brand I have are Talon and they have been great for TIR and grip without needing to strain on the wrench


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