Double check and offer suggestions...planning

[~TM~]

Eurisko, did you ever receive your nook ballscrew? I was browsing through Reids sight and saw mostly thomson ballscrews. What exactly did you order? Was it .631" .2 lead? I'm still trying to decide on my lead screws. Either 1/2" 10 5start with dumpster nuts and pillow/flange bearings or a ballscrew from Reid. ANY suggestions would be appreciated : ) Which would have better accuracy.
I'm in the process of obtaining some thk linear guides and a @ 14" ballscrew for my z-axis. And i'm still using the 60" thk linear dovetail guides for the long axis.
One more question...would i be ok to use an unsupported 30mm hardened shaft (the picture above) as the gantry axis.

[Eurisko]

Hi Tommy,

Yes, my Nook ballscrew arrived within a few days of placing the order.
It is a .631 dia, .200 lead. 48 inches long.

Here's the link:
Nook .631-.200 ballscrew

Haven't had a chance to play with it yet. I'll probably save it for my next (larger) router.

Originally Posted by ~TM~ I'm still trying to decide on my lead screws. Either 1/2" 10 5start with dumpster nuts and pillow/flange bearings or a ballscrew from Reid. ANY suggestions would be appreciated : ) Which would have better accuracy.

The Reid rolled ballscrew's lead tolerance is +-.004 per foot.
Reid precision acme threaded rod (single start) is rated at +-.003 per foot.

I don't know the specs on the multiple start acme rod, but I doubt that it will be as accurate as the precision acme or rolled ballscrew.

Originally Posted by ~TM~ One more question...would i be ok to use an unsupported 30mm hardened shaft (the picture above) as the gantry axis.

I would try it unsupported BUT give myself the option of installing full supports later if necessary. It would be interesting to measure the difference in rigidity...

[~TM~]

Thanks eurisko for the info...I guess the ballscrew would lend itself to being more efficient than the acme screw then? I feel that the accuracy is close enough to being the same where it wouldn't matter. How fast would the ballscrew push the axis? I know that the acme 10 5 start could push them at around 150-250ipm from what i've heard, with the correct motor/voltage setup. Is this doable with the ballscrew? I'm wanting to achieve around 200-300ipm, so whatever it takes.

[ger21]

Originally Posted by ~TM~ Is this doable with the ballscrew? I'm wanting to achieve around 200-300ipm, so whatever it takes.

First, you need to check the critical speed for the distance of the screw and see if you can spin it at 1000-1500rpm. And more importantly, how much torque will your steppers have at 1000-1500rpm. I'm going to guess and say very little.