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Post by woodwrangler on Jan 10, 2019 15:38:59 GMT -5
I'm looking at putting a Musclechuck (https://www.musclechuck.com/) on my AR8 Pro CNC. However, I need to determine what the collet size (ER20?) and spindle threat pitch. Anyone know?
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Post by gerry on Jan 10, 2019 16:03:37 GMT -5
A AR8pro has an ER20 collet. I've heard a lot of bad thing about the MuscleChuck slipping. It only takes a second to tighten a ER20 chuck. I really don't see the benefit.
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grg
Junior Member
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Post by grg on Jan 10, 2019 17:46:13 GMT -5
A AR8pro has an ER20 collet. I've heard a lot of bad thing about the MuscleChuck slipping. It only takes a second to tighten a ER20 chuck. I really don't see the benefit. I was looking at those last night and had never heard of them before...I agree. The biggest difference is you have one tool instead of two - but the muscle chuck has one spot that the tool has to be inserted (in that cap screw) and puts one more fitting (variable) between the motor and the tool. |
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Deleted
Deleted Member
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Post by Deleted on Jan 11, 2019 6:17:08 GMT -5
ER20 collets should be able to get your runout to 0.0004", I really doubt that the runout on the MuscleChuck is even close so I would ask them what they guarantee. Further, ER20 is widely used in industry for a reason and is therefore well tested and has a long track record. They're easy to use too. Think carefully as your results will likely get worse and then you may switch back and end up with a shelf decoration.
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Post by stevem on Jan 11, 2019 10:11:48 GMT -5
I bought some new ER20 collets from precisebits.com agout 4 months ago. They are much better than the ones I got that were from China when I got a spindle.
I also thought about a Mustlechuck, but I really don't think it's worth The money they are asking for it. It doesn't take that long to change bits with standard collets.
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Post by Axiom Tool Group on Feb 6, 2019 8:14:34 GMT -5
The collet nut used is an ER-20 Type A....
However, this Type A nut is available in two thread pitches. Be sure to get the course thread M25x1.5...
If in doubt, you can order a standard replacement collet nut directly from Axiom, we also carry an assortment of collets in sizes ranging from 1/8" to 1/2".
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Post by nlalston on Nov 3, 2020 17:38:52 GMT -5
A AR8pro has an ER20 collet. I've heard a lot of bad thing about the MuscleChuck slipping. It only takes a second to tighten a ER20 chuck. I really don't see the benefit. Thanks. I have ,now, decided against it. |
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