Hi Richard,

I have a Chester Super Lux with an R8 spindle. The ER32 collet chuck (sourced from Hong Kong) has a pair of flats on it. An old 13/16" W spanner fits nicely. I think I would have trouble tightening the chuck without this.

Regards,

Trevor

My ER32 chuck has four flats on it for a spanner, can’t remember the size off hand but it’s quite large. I bought one of those black DIN spanner’s from eBay to fit it quite cheaply.

+1 for bearing nut closer & +1 for holding the top pulley/belt

but if it's still tight I sometimes use the draw-bar soft hammer to tap the end of the spanner to slacken off the collet nut. This technique is needed more often for my Clarkson and Posilock chucks with plain closers.

The inertia and belt gearing effect usually provides enough resistance to work.

HTH

Jon

Edited By Jon Gibbs on 11/01/2018 09:39:21

I bought a new Warco VMC supplied with an ER32 collet chuck with no spanner flats on the chuck.

Using a carbide end mill (a good deal from Ebay) machined some flats on the chuck.

Its tough steel so an HSS cutter probably wont cut.

Accuracy is the same as before cutting the flats. .

Sorry Richard, forgot to post picture but it's in my album ER Chuck.

Michael

Absolutely true, but as you will well know, ER collets will do things R8 won't, like cater for both imperial and metric shank cutters

Um… I've got both metric and imperial R8 collets? Yes, I know that ER cover a range, but actually you really need at least a few imperial ER collets to hold some of the imperial sizes properly. Anyway, one only uses a few cutter shank sizes – 6 / 8 / 10 / 12 mainly in my case though I have a few surplus imperial cutters.

John

I've got both metric and imperial R8 collets too, as well as an ER40 set.

I perhaps didn't make my earlier post clear – I meant that to cover both metric and imperial cutter shanks in R8, you need both metric and imperial R8 collets, whereas in ER, as you say, one set will largely cover a range.