RE: [CAD_CAM_EDM_DRO] Need help with Mill/Drill retrofit

If you use ballscrews, then you may have problems in the manual mode
(turning the crank). The reason is that the ballscrew will tend to
backspin unless you engage the table lock for the axis not being used.
If you forget to tighten the table lock for the axis you will get drift.
I would go all the way and cnc it and use a good software program to do
MDI commands.
Jeff Davis has some excellent servo motors for a mill/drill. If you
checked out his web site you probably saw my gecko servo amp case. It
really makes putting a servo system together quite nice. My db25 screw
terminal board makes connecting the G320/G340 quite easy.
Dan

-----Original Message-----
From: protman16 [mailto:tbrookin@...]
Sent: Thursday, October 10, 2002 6:38 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Need help with Mill/Drill retrofit

I am currently starting to do a cnc retrofit on a Mill/Drill. I have
most of the mechanical items (ballscrews, bearings, pulleys, belts,
etc.) and have started to replace the lead screws. My plan is to
keep this machine dual-purpose manual/cnc. I am at the point where I
need some help with the control side of things. I need some help in
locating "low cost" servo motors, controller and/or card for PC
interface. I will be using an old Pentium 133 for this retrofit so I
don't think I will have any problems with control capability. Even
though I am trying to keep the cost down I have opted to go with
servos because I have more experience with them. I have done some
searching on the web for PC motion cards and found that most are out
of my budget for this project.
I have visited Jeff Davis site and got some ideas form there, but as
for get this thing connected to a PC I will admit I need help. Any
thoughts would be appreciated. Remember I am trying to keep the cost
down.

Trevor



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