Re: [CAD_CAM_EDM_DRO] Re: Lead screw/Guide rail install/pre-load

Yes it might work but there are some things to consider:

You'll need more under the table clearance for the motor than you will for a standard ball screw set up.

The ball screw assembly in the motor might be a product specific item and would probably cost a lot more to replace if that ever became necessary.

How much extra labor would be involved in a set up like this?

Would you have to redesign and replace any existing brackets on the machine.

Are the motors large enough for the machine your going to put them on?

I'm brain dead tonight...anyone else want to add to this list?

Smoke

-----Original Message-----
From: Hugh Mahlendorf <hmahl@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>; CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Thursday, October 26, 2000 6:54 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Lead screw/Guide rail install/pre-load

>Just a suggestion:

I was looking through a catalog earlier today and found stepper motors that
have internal through threads on the armature of the motor so that a
leadscrew (will get more particulars on this tomorrow) can be fixed at both
ends and the motor fixed to the table, letting the stepper do the turning,
thus "crawling" back and forth on the lead screw. This would eliminate all
mounting bearings and also eliminate the need for intermediate leadscrew
support (the motor in effect becomes the support). One motor (probably a
NEMA 42) mounted on the underside of the movable table in the x and y
center would control the x movement without racking.

Any reason this wouldn't work? I suppose the stepper would be kinda
expensive but would'nt it still be cheaper than all the bearing supports
mentioned earlier.

If I am missing something, please let me know as this is the type of table
I am contemplating on my small CNC router.

Hugh

>I'm doing what is essentially a 3 axis router: 48" x 36" x 18" of
>cutter travel. It'll have the z-y plane fixed in x, with a
>travelling x table moving below the y-z plane.

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