1978 Enco GL-30B Milling/Drilling machine

[jeernst]

Hello, I just inherited this Enco GL-30B circa '78 mill. Is the R8 collet the correct size for this model? Because the new R8's I bought don't fit.....the (OD) are 0.010 larger than one original that came with it. That is: .950 vs .940". I was also surprised the draw bar is a standard thread, 7/16 -20, when every other nut & set screw on the mill are metric. Any knowledge would be appreciated.
Thx John E.

 

[larry_g]

Well .95 is the correct size and 7/16-20 is the correct thread for a R-8 collet I'd suggest that you check your spindle. Make sure that the pin is in the correct position and not sticking in to far or sheared off and smeared around the inside of the spindle..



lg
no neat sig line

 

[BillK]

Call MSC and ask them ? I am pretty sure they are still supporting all of the Enco machines. Some of those offshore machines had strange size tooling.

 

[Falcon67]

AFAIK, that's just a Rong Fu RF30 or some such, so R8 spindle, etc, etc. Same on the drawbar, same thread on my Griz G0519 square column, R8 spindle unit. If the spindle bore is too small, you could have issues finding tooling for sure.

Page has notes on R8 collet dimensions

https://www.sommatool.com/catalog/collets/r8 collets.asp

 

[jeernst]

Thanks all for getting back to me. Much appreciated

 

[jeernst]

Thanks again for the thoughts Larry. After grinding 2 of 11 collets to fit (I'm good on a grinder), I found some 240 grit emery cloth, wrapped it around a piece of 1/2" pvc, and honed the inside of spindle with it running. I did this a few times, and now they all fit! The tolerance preventing full insertion of collets was only about .001-.002 Thanks again
John E.

 

[BillK]

John,
You should not be grinding on collets. That pretty much ruins their accuracy. They also sell a special tool to "clean" the id of the spindle. It does not take much to ruin the accuracy of the mill using the wrongethods.

 

[metalmagpie]

John,
You should not be grinding on collets. That pretty much ruins their accuracy. They also sell a special tool to "clean" the id of the spindle. It does not take much to ruin the accuracy of the mill using the wrongethods.

Accuracy? Mill-drill? Your advice is spot on but given that spindle had a few though of crud in it, I doubt he hurt it much.

metalmagpie

 

[jeernst]

Not hurt at all. All the collets fit like a glove. Thanks