Re: [CAD_CAM_EDM_DRO] Re: help with Y axis on bridgeport

Wally: My knee"feed" is actually a big stepper motor for positioning. I have not ,as yet, converted to ball screws. Everything is
original and unaltered. The mount bolts to the knee using those same 1/4X20 screw holes that secure the bearing retainer(that alloy
piece I told you about. You may consider another belt ratio than 2to1 for this feed. Not so much for power but the "rounding off
"factor that some software uses. I think that I used 1 to 2 1/2 ratio. Do use a 1" wide belt here(big load). Let me say again, I
have not modified in any way any original pieces. No holes drilled. Everything bolts on to existing holes. I just finished a cnc
conversion of my Hardinge HLV-H tool room lathe. Same deal, no hole drilled in the machine. Used original pieces only. Challenging
but possible.
I did take some shots with my video camera of the mounting plates. I can probably digitize some shots and put them up if you want.
Well, I am getting ready to take a 4+ hour drive to my mom's for Thanksgiving. Will be back Friday night.
Carey
Wally K wrote:

> Hi Carey, i was wondering on your knee powerfeed if you made this a
> stepper or servo drive for precision position. Or put a motor on it
> with a power switch for rough position (thats what i was thinking of
> doing.
>
> Did you modify your knee axis to mount motor.
>
> Wally K.
>
> --- In CAD_CAM_EDM_DRO@egroups.com, "Carey L. Culpepper" <mr.c@b...>
> wrote:
> > Wally: I did a Bridgeport conversion and can tell you what I have
> done. Take the crank handle off. Unbolt nut and crank slides
> > off.Then remove the scales. What you will find is an alloy
> (aluminum or zinc) plate with 3 - 1/4 x20 screws. This is your new
> > mounting point. It may not look like it but it can be if you want
> it to be.. Both the x and y axis are the same. At least on the
> > left end of the x axis anyway. I even mounted a stepper on the knee
> feed(my z axis). Same deal- that alloy plate with 3 screws. My
> > knee feed motor mounts directly to the left side. My y motor mounts
> to the right side but lower and close to the machine. The x
> > motor is mounted on the left end with the motor outboard so I lose
> no travel. Every axis is belt driven (2to1). The motor mounts are
> > machined from 1/2" plate aluminum. The x and y mounts are exactly
> the same. The z is at an angle. I machined a circular recess in
> > the back side of each plate. This is needed because the alloy
> plates with the 3 holes don't come flush with the casting. It might be
> > easier just to make a sheet metal shim or just 3 thick washers to
> space out the motor plate. These alloy plates(with the 3 holes are
> > actually holding in the bearings. The last step is to cut some
> tubing(5/8" ID) to slip over the shaft after you put the pulley on.
> > This is a distance piece to tighten up to the bearing. I just put a
> 3/4 box wrench on the y feed if I need to manually move that
> > axis. The x axis still has the right side hand crank. If you decide
> to power the knee let me know. The hub screws off. I struggled
> > with that for a while until I discovered that.
> > I hope that you are able to visualize what I have described. I have
> not altered any parts or drilled any hole in the machine. I just
> > used what is already there. I hope this helps. Let me know if you
> need more information. Carey
> > Wally K wrote:
> >
> > > I am trying to design the mounts for a bridgeport retrofit to CNC.
> > > my machine is assembled and i cannnot see how the internal end of
> the
> > > Y axis is mounted. Does anyone have pictures or drawings of this.
> > > Or any words of advice.
> > >
> > > Wally K.
> > >
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