Re: sherline Ballscrews (Yes, you CAN!) But I wouldn't.

--- In CAD_CAM_EDM_DRO@egroups.com, ballendo@y... wrote:

> Alvaro wrote:
> >Sorry to say this,but,there is no way that one can fit a Kerk or

BSA

> >nuts on the x,y.
> >Best thing would be moglice.
>
> Alvaro,
>
> Be careful not to underestimate the power of a dedicated mind. It

HAS

> been done!!
>
> The centerline to x table interference(also the c/l to base
> interference on Y)on a "stock" sherline 5400 mill is .235(measured
> empirically, the design value is probably .250 since Joe Designed

the

> mill and he likes to work in inches)(on re-read I guess it MAY be
> 15/64)
>
> On pg 2-17 of Ball screws and actuators catalog are 2(two!)

possible

> solutions! (1/2 of 16mm .6299" clearance needed, which is .315)
>
> Since .315 is bigger than .250(or.235) by .065, you may say it

CAN'T

> be done. BUT, if you MILL A CHANNEL in the saddle and base, you

find

> it CAN fit. AND HAS!
>
> FYI, I do not believe this is the best way to treat a sherline

retro-

> fit.
>
> I would probably use the orig. nuts (as many hundreds of successful
> Sherline retro's from at least SEVERAL companies have done for
> years). Or I may look at the results of the moglice people and go
> that route.
>
> Ballendo
>
> P.S. This example used a STANDARD part from ONE company. Screw/Nut
> MFG companies are used to making "specials" to fit "extreme"
> situations, in which case the sherline certainly applies :-)

Sorry,I was talking about no major mods.If one machine a chanell it
shuld fit.I have machined a new sadle(bigger) and had it hard
anodized to accept the 1/4x20 zero backlash BSA nut.
But becouse of the size of the screw 1/4" it just can't take
it.maybe the 10mm x2mm that i've used on the z axis would do it,but
than Iwould have to machine a new sadle eaving bigger.
So,Ive got tired of playing with it and bought the Big ,bad,Grizzly
minimill.
this one worth the efforts to retrofit.
i've allready got the ballscrews on it at a cost of $140.00 per axis.
and best of all no backlash!
it's much easyer to fit ballscrews on the Grizzly than the sherline.