Mounting of chuck to this type of planetary gearbox with stepper motor

[bigrock]

Hi everyone, here looking to build a 4th axis for my cnc machine, has anyone used this type of system, the only way I can see to keep the chuck on the output shaft is used a screw, thoughts on it, thanks.
https://www.omc-stepperonline.com/ne...s22-2804s-hg50

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[joeavaerage]

Hi,
ideally you'd use the key and a matching keyway, but I think a screw would be OK.

The specs say that the lash is 1.6 degrees, which is quite high for a fourth axis. Additionally you are relying on the bearings in the gearbox to support the chuck.
All-in-all that will very much limit the work you do to the lightest possible parts.

I have used an Atalanta Drives servo reducer. It has a lash of <2 arc min and a rated torque of 130Nm, and a max torque of over 400Nm, but its much bigger.
For size comparison the chuck pictured is 100mm in diameter.

Craig

[bigrock]

Hi,
Thanks for the input, will have to keep looking then, will checked the drive you mention. Want to used this chuck which weights 12 lbs.

https://www.amazon.com/125mm-Chuck-M...s%2C199&sr=8-5

[joeavaerage]

Hi,
what size machine are you trying to fit it to?

Craig

[bigrock]

Machine size is 3 foot by 3 foot, I have an air cool spindle.

[joeavaerage]

Hi,
well my fourth axis is about 15kg....so probably to big for your machine. The worm drive, if I bought brand new is over $1000USD.
I bought it off Ebay for much less than that.

I saw this one the other day, its the same size:

https://www.ebay.com/itm/202301790898

Its still probably to big for what you want but at $149USD for a new old stock servo reducer of this quality is good buying.

Craig

[bigrock]

Sir,
I thank you, I will be mounting it on a 6" by 1" by 5' hollow section aluminum, which can be changed if it isn't adequate, I will looked to order it, better to have such a unit and know that it can work then to get something that I maybe a trial and error, will be cutting aluminum and wooden pieces, may have to get a nema 34 stepper motor to turn it instead of nema 23 which was in the original plans.

[joeavaerage]

Hi,
from personal experience it is a very solid piece of gear. I have driven it with a 750w Delta B2 servo (pictured).

Originally I had a 23 size stepper on a 10:1 planetary to drive it, but that meant the fourth axis would only turn at 10 rpm. Many of my four axis toolpaths have many revolutions,
hundreds at least, and they take forever at 10 rpm. With the servo, it does 3000rpm, so the fourth axis now does 150rpm, which is much better, but I sure don't want it to go any
slower.

I'm building a fifth axis and it has a 6.75:1 reduction, <1 arc min lash, 70Nm (rated). It too has another 750W Delta B2 servo and can do 444rpm....so that a real step in the right
direction for those long continuous rotation toolpaths.

Craig

[bigrock]

Hi,
The servo motor is outside of my budget, yes 10 rpm is abit in deed. Thumbs on machining the part to fit the box.