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Milling for beginners

Please use this thread to ask questions of make suggestions about the series in MEW

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Martin Connelly12/01/2019 11:45:12
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You can get tap driving sockets from Snap On that can be held with a collet such as R8 but allow the tap to self align and move up and down a small amount. A bit like a cheap and compact tapping head.

**LINK**

Martin C

Ron Laden12/01/2019 12:52:19
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Thanks Martin but there is no problem tapping on the SX2P with the tap mounted correctly in a collet. Why some people use a loose collet with the drawbar partly unscrewed I have no idea as there is no need.

From what I have found I think the key is to have the head well balanced. I changed the lever and spring over to a gas strut which has left the head quite free to operate and its lost the heavy feel it had on the lever/spring. It takes very little effort to keep the head in front of the tap, in fact I can do it with one finger and there is no binding or sign of the tap trying to pull or push the head.

Ron Laden13/01/2019 08:01:32
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Posted by JasonB on 12/01/2019 08:38:49:

Ron as soon as the SX2.7 goes into tapping mode it uses a different set up on the chip, Ketan has confirmed to my that the torque of the spindle is much increased using his scientific "Gauntlet" test and although the tap stops and reverses very quickly there is some ramp down and ramp up so as not to strain things.

For yours I would watch to see if the motor starts to get hot if doing more than one or two and also pause in the neutral position before going straight to reverse.

Also I'm not sure if your stop start using the speed control is the ideal way to be using the mill, I would need to check with Ketan whether you should have the speed set than use the on/off at the side. So tapping would be set a speed & direction - green on button - tap hole - red off button - change direction - green on reverse tap out - red off.

Jason, having checked the mill this morning I think once again you are probably quite correct in suggesting using the on/off switch for the change in direction. If I use the speed control the mill starts/stops instantly whereas with the on/off switch there is a 2-3 second pause before it starts up.

Ron

JasonB13/01/2019 08:15:58
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I think that is your best bet if you are going to do more powered tapping

Posted by Ron Laden on 12/01/2019 09:02:09:

Thanks Jason, Ketan did tell me that the SX2P does have built in torque increase at low revs and I know that to be true as the mill has surprised me once or twice with decent power at low speed.

The extra torque that I mentioned when going into tapping mode is over and above normal slow speed running. Ketan tested the mill in normal slow running and then at the same speed in tapping mode and there was a lot more torque available.

Neil Wyatt13/01/2019 08:25:26
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I expect the controller assumes tapping will only be for a short time, so it can allow a higher current for tapping without risk of overheat.

Neil

Ron Laden13/01/2019 08:26:13
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Posted by JasonB on 13/01/2019 08:15:58:

I think that is your best bet if you are going to do more powered tapping

Posted by Ron Laden on 12/01/2019 09:02:09:

Thanks Jason, Ketan did tell me that the SX2P does have built in torque increase at low revs and I know that to be true as the mill has surprised me once or twice with decent power at low speed.

The extra torque that I mentioned when going into tapping mode is over and above normal slow speed running. Ketan tested the mill in normal slow running and then at the same speed in tapping mode and there was a lot more torque available.

I dont have that of course but it was good to know that the mill does have at least some increase at low speed.

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