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Thread: ER chucks for 260/9" Hercus
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17th Jun 2019, 06:46 PM #1Most Valued Member
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ER chucks for 260/9" Hercus
Anyone who may be interested in these please note the the accuracy on your machine can not be guaranteed and you may need to re cut the 8 degree collet taper, machining allowance for this has been allowed for if required.
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22nd Jun 2019, 01:47 PM #2Most Valued Member
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I bought one of Peter's ER40 collet chucks for my Hercus 260. It had 0.1mm of runout which was easily removed by taking a skim cut with a HSS boring bar. I set the compound to the correct angle by running a DTI along the inside of the chuck and adjusting the angle until the DTI showed no movement. I confirmed the compound setting by turning a piece of stock to 8mm to ensure concentricity, slipping an 8mm collet onto it and checking with a DI.
I'm very happy with the chuck. I no longer have any limitation on stock length and no more stuffing around with a draw bar.Chris
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16th Nov 2019, 05:34 PM #3Diamond Member
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Hi,
I bought one of Pipeclays ER32 chucks a couple of months ago for my 260ATM. I've used it a few times now and it works great. Just letting Pete know.
Ben.
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17th Nov 2019, 01:08 PM #4Diamond Member
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They look great!
Do you also make a pin spanner for tightening the ER nut against the chuck?
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17th Nov 2019, 02:37 PM #5Most Valued Member
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Just use the collet spanner, you can make a purpose pin spanner,but the collet spanner works fine.
You may find that a 2nd spanner is beneficial as you can hold the chuck with one whilst you release the nut.
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