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Leadhead
09-06-2017, 06:25 AM
Trying to make decisions on the way to go, in order to get some experience of 4th axis machining. The capacity of one of the 100mm Chinese harmonic drives would suffice. Or I could convert a Vertex D/head. Anyone have any experience of the Chinese units please.

Chaz
09-06-2017, 02:04 PM
Also keen to know this as Ill be looking at a 4th axis soon for my new machine.

Seafax
09-06-2017, 07:01 PM
I got a 4th axis bundled my 3040 machine. I find that mechanically it's not bad at all bad (reasonable bearings and tailstock) , but it's seriously let down by the puniest stepper I've ever seen and a tommy bar chuck that's really awkward to use insomuch as it's not very well built and runs of true by varying amounts dependant on how much you tighten it. It might be worth a look if you already have a chuck and a stepper kicking about that you can press into service and would definitely well enough for you to get the hang of using 4 axiz on very light duty objects but for me that's about their limit.

Col.

Chaz
09-06-2017, 07:38 PM
I got a 4th axis bundled my 3040 machine. I find that mechanically it's not bad at all bad (reasonable bearings and tailstock) , but it's seriously let down by the puniest stepper I've ever seen and a tommy bar chuck that's really awkward to use insomuch as it's not very well built and runs of true by varying amounts dependant on how much you tighten it. It might be worth a look if you already have a chuck and a stepper kicking about that you can press into service and would definitely well enough for you to get the hang of using 4 axiz on very light duty objects but for me that's about their limit.

Col.

For me, id remove the stepper and put a servo on. Sorted.

Leadhead
10-06-2017, 05:58 AM
Thanks for info - Col, could you advise size of the stepper, spec. or dimensions. Also do you have the 100mm chuck.

Seafax
10-06-2017, 11:06 PM
I have the 75mm chuck with a nema 23 1.8NM 3 amp stepper.

Chaz
11-06-2017, 09:10 PM
Trying to make decisions on the way to go, in order to get some experience of 4th axis machining. The capacity of one of the 100mm Chinese harmonic drives would suffice. Or I could convert a Vertex D/head. Anyone have any experience of the Chinese units please.

Can you link one of these harmonic drives please?

Leadhead
12-06-2017, 06:57 AM
Hi - ebay search for CNC harmonic 4th axis.

Link: https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2060353.m570.l1313.TR0.TRC0.H0.XCNC+harmo nic (https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2060353.m570.l1313.TR0.TRC0.H0.XCNC+harmo nic+4th+axis.TRS0&_nkw=CNC+harmonic+4th+axis&_sacat=0)

Chaz
12-06-2017, 07:42 AM
Great, thanks.

Leadhead
12-06-2017, 12:39 PM
When can we expect your review?:smug:

Chaz
12-06-2017, 12:42 PM
When can we expect your review?:smug:

Me? Nothing yet, need to finish Thor first.