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Subject:	Re: cnc tool holders thread direction vs spindle rotation
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Message Thread:

cnc tool holders thread direction vs spindle rotation

6/26/23

RODNEY BLACKERBY

Member

New cnc owner my question is that the thread rotation on 1 tool holder left handed, I would assume that spindle rotation vs thread direction make a difference this would be my thought's . Please correct me if I'm wrong

6/26/23 #2: cnc tool holders thread direction v ...

Mike

LH tool holders are for LH routerbits. Safer to run than putting a LH tool in a RH holder. Typically used for avoiding tear out in solid wood or edge banding on one side of a 3 sided cutout.

6/26/23 #3: cnc tool holders thread direction v ...

Karl E Brogger

Member

Website: http://www.sogncabinets.com

I only have one left handed tool in a regular tool holder that isn't used often.

I'd assume properly torqued it wouldn't be an issue? There isn't harsh starting or stopping that would create enough torque on the nut to loosen.

Probably wouldn't be a bad idea to have one if used in the regular. I think I'm going to check mine to make sure it is torqued properly tomorrow....

6/26/23 #4: cnc tool holders thread direction v ...

Dylan Bayliss

Website: http://Www.Cnc-tool.com

We sell both rh and lh cnc tool holders
U can also purchase a holder with a bearing nut and that allows a lh tool as the anti rotation torque is managed by the bearing and not by unthreading the nut.
Some just want the added insurance as on occasion the bearing can fail due to dust contamination.
U did not specify your type of holder so may or may not be avail for your holder
Regards
Db

6/27/23 #5: cnc tool holders thread direction v ...

RODNEY BLACKERBY

Member

HSK 63 F? sounds correct it's on an scm machine had to order some collet's for the machine If I'm not mistaken I think the collets are 452e?? ordered some from GDP yesterday.

6/27/23 #6: cnc tool holders thread direction v ...

Dylan Bayliss

Member

Website: http://www.machineconsult.com

SCM like to use ER32 Collets, but on occasion ER40. not sure what 452e is?

6/27/23 #7: cnc tool holders thread direction v ...

Dropout

Member

I think just be smart. I'd probably chance a 1/4 bit with the wrong threaded tool holder but a 6" molding head not so much.

6/28/23 #8: cnc tool holders thread direction v ...

Erick

Member

Website: https://virmer.com

So what's the problem? Change the direction!

Yes, on a CNC milling machine it is possible to change the direction of rotation of the cutter. This can be done through the machine software, where you can set the appropriate command. Also, some machines may have the ability to change the direction of rotation using switches or adjustments on the control panel.

https://virmer.com/catalog/laser-machines/

6/28/23 #9: cnc tool holders thread direction v ...

Erick

Member

Website: https://virmer.com

You are correct in assuming that the spindle rotation direction can affect the thread direction when using a left-handed tool holder on a CNC machine.

When cutting threads, the tool rotation direction should match the desired thread direction. For example, if you want to cut a right-handed thread, the tool should rotate in a clockwise direction. Conversely, if you want to cut a left-handed thread, the tool should rotate counterclockwise.

To achieve the desired thread direction, you may need to adjust the spindle rotation direction on your CNC machine. This can typically be done through the machine's control panel or programming software. By changing the spindle rotation direction, you can align it with the thread direction required by the left-handed tool holder.

https://virmer.com/catalog/laser-machines/

6/28/23 #10: cnc tool holders thread direction v ...

Karl E Brogger

Member

Website: http://www.sogncabinets.com

I'm not saying anybody is wrong, just thinking out loud and trying to better understand the physics.

The concern of the nut coming loose would be coming tp a very abrupt stop and there is enough kinetic energy there to overcome the friction of the threads. So that the mass of the nut keeps spinning if the tool holder stops.

I don't think the nut is taking any of the load of the rotation of the tool.

The collet is gripping the tool.
The holder is gripping the collet.
The collet has very little contact with the nut.
The nut is packing the collet into the taper of the holder to hold the tool.

I'm thinking this isn't much of a concern unless swinging something really big? The spindle spools up and down to cutting rpm, if it goes from 16k rpm to zero abruptly I'm guessing you've got bigger issues?

I'm sure the collet design plays a part in this as well. I want to say mine are SYOZ 25. I haven't ordered anything in quite a while.

BUT, if I had any large tools running counter clockwise, there probably isn't a downside.

6/29/23 #11: cnc tool holders thread direction v ...

Chad

Use a heat shrink holder. Problem goes away, tools last longer.

View higher quality, full size image (1488 X 1706)

6/30/23 #12: cnc tool holders thread direction v ...

Erick

Member

Website: https://virmer.com

Chad, agree with you!!

6/30/23 #13: cnc tool holders thread direction v ...

RODNEY BLACKERBY

Member

Very interesting never seen this design, I'm new to the cnc world and have been researching tool holder collet's etc, found most my info off the GDP Website that's how I determined the holder and collet that I have. stamped on The collet that I have is was stamped 463f , tool holder seems to be hsk63 er40.I will try and post pictures later but thanks' for everyone's help.

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