Re: help with Y axis on bridgeport

Hi Carey, yes it would be nice if you took a few pictures of how you
powered your X, Y, Z and knee axis and post them. I am sure i will
learn from them.

Wally K.






--- In CAD_CAM_EDM_DRO@egroups.com, "Carey L. Culpepper" <mr.c@b...>
wrote:

> 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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