Hi Roy,
Thanks for the reference. I also intend to put a BB in the compound
since the bearings are so cheap ($0.72 for a 6001-2RS) but, as a
newbie, am not sure about that design -- it looks like the press fit
bearing could get stuck in the holder and make it difficult to remove
since the bearing covers the bolts which retain the holder. Perhaps a
set screw could be used instead or possibly threads for ejector
screws?
I also saw a BB design for the 7x cross slide somewhere on the net
but can't recall where - old age is hell! So, I'm adapting Steve
Bedair's 9x20 design to the 7x:
I haven't figured out exactly how I'll retain the bearing shell but
am leaning toward a set screw. I may make the holder from two
pieces, the spacer and the bearing holder, and bolt them together.
This to minimize the amount of material removed while providing
enough meat for a set screw.
I also ordered a couple of bearings with an 8mm hole to fit the
carriage drive ($0.44) so eventually all my controls will use BB's.
Given the low cost of the Asian bearings, it is surprising that they
don't use them during original manufacture. It costs much more for
shipping than bearings when you add them later.
John
--- In 7x12minilathe@..., "roylowenthal"
<roylowenthal@y...> wrote:
Here's a compound ball bearing mod:
<>
Somewhere, I thought I'd seen a cross-slide ball bearing mod; of
course, I can't find it now! (Maybe somewhere in the 7x10 links or
files?)
Roy
--- In 7x12minilathe@..., "John" <moran03@e...> wrote:
I'm getting ready to mod my cross slide along the lines shown
here:
At the same time I'd like to add a ball bearing to the cross
slide
shaft.
After looking at the whole project I noted that Gordon Scott's
mod
moves the cross slide travel about an inch toward the operator
but
doesn't seem to actually increase the travel.
The cross slide lead screw has extra threads which would allow
additional travel once the material is milled away but this
would,
of
course, require a longer lead screw shaft by an inch or so on the
knob end.
My current plan is to make an extension and bolt it onto the
existing
shaft by using a much longer screw to hold the knob in place.
This
extension will hold the ball bearing to lock the inner race to
the
shaft and a complete new part will be fabricated to hold the
outside
race of the bearing such that the original leadscrew will be only
a
few mils farther forward than at present (this so the flange on
the
shaft won't bind against the end of the carriage).
Has anyone done a similar mod? I've found a description of a BB
added to the cross slide on a 9x20 but haven't found this for the
7x.
This is a more extensive (pun intended) mod to my lathe than any
attempted previously so any advice gratefully accepted.
John
