Re: Sherline Flexible Leadscrew Coupling

Hi Raymond;

After seperating the 2 halves of the coupling during disassembly, I
thought I would check out the other axis too.

The Z Axis grub screw was loose, and probably only seconds away from
undoing itself enough to burr the stepper shaft and prevent it from
being removed too !

My steppers have flats, but I wm now going to put some 222 (loctite
threadlock) onto the grub screws for all axis before re-assembly, I
suspect that the screw undoing without any threadlock is inevitable,
it's just a mattter of time !

I have also replaced all of the CNC bearings, and recommend that
anyone assembling a CNC conversion for the sherline forget about the
spanner to tighten the thrust nut, and just use your fingers. All my
axis bearings were pitted caused by over-tightening of these thrust
nuts with a spanner as recommended in the instructions, you only
need to take out the end play and then lock the nut with threadlock.

Thanx as always

PeterC



--- In CAD_CAM_EDM_DRO@yahoogroups.com, Raymond Gage <gagefam@s...>
wrote:

> Peter,
> Same thing happened to me. An unfortunate fact of life with

using a

> Sherline or any other lightweight machine for CNC is that if you

want to

> make things sing, stuff is going to vibrate loose and/or break.

The

> fact that Sherline doesn't use locking fasteners or even

locktight,

> means that parts are going to come loose if you run any kind of

speed

> through your CNC. Moral to the story, when you convert a machine

to

> CNC, make sure that all fasteners that can be are locking. Now I

will

> get off my soap box.
> The answer to your question is that you can buy the couplings

from

> Sherline for about US$10.00 apiece. Can't remember the P/N, but

you can

> find it by looking at the exploaded drawing of the CNC version of

your

> machine either in your own documentation, or at the

www.sherline.com web

> site. If you call their sales, they will know what you are

talking about.

>
> Regards,
> Raymond
>
> Peter Cruickshank wrote:
>
> >Hi;
> >
> >I have broken one of the sherline bellow flexible couplers during
> >removal.
> >
> >Does anyone know if this is a sherline-manufactured part or if

it's

> >a standard part.
> >
> >Secondly does anyone know where I can buy a replacement or

failing

> >that does anyone have a drawing for it so I can make it ??
> >
> >many Thanx
> >
> >Crankshaft.
> >
> >
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