Re: [CAD_CAM_EDM_DRO] Re: Rong-Fu RF-45

In a message dated 07/31/2000 7:00:14 AM Hawaiian Standard Time,
tmay@... writes:

<< Peter,
The bearing lock nut sounds better, does NSK have a catalog on line? I
looked around there web site, but couldn't find anything to show me the
parts.
Terry >>

Terry,

I have not looked at the NSK website as I have a copy of the catalog in
question. I don't have the part number of the screw handy, just tell me what
the bearing journal diameter is. I can draw up a .dwg file for you if you
like. I could fax you a copy also but I will not scan and post it. I could
also post my drawing in a jpg or such if required.

Since these blocks have very similar dimensions brand to brand, you may
want to check the THK or Nook sites. I know Nook has drawings of ball screw
thrust bearing blocks on line. If you are going to carve a new side plate,
I'd integrate enough meat into it so I could mount the axis motor. If at all
possible, also include provisions for a protective shield over the cog belt
or flex coupling (whatever you decide) to prevent problems with debris build
up. I will design mine in a few weeks but wonder if Roland of Cardinal
Engineering has not designed his yet. He is usually very good about debris
control.

The bearing lock nut is a standard part available at any bearing supply
house. The bearings are angular contact ball bearings, you should specify to
the bearing supplier that you want matched pairs. The opposite end of the
ball screw would require a "simple" mount that has only a single floating
ball bearing.

If you are gonna cut abrasive materials on your mill, I'd also make
provisions for shaft seals. At the very least, a zerk fitting to allow
relubing often. If you are cutting aluminum and such, you might relax the
sealing effort.......

Peter
THRD, Inc.