Re: [CAD_CAM_EDM_DRO] Profile Grinding

Hi Joe: ( at least I'm assuming you're Joe!)
Have you considered mounting the dressing unit above the wheel rather
than below?
The reason I say this is that you want to disturb your setup as little as
possible when you switch between dressing and grinding.
Getting all your blocks perfectly oriented on the magnet again after you've
just stripped them all off to mount your dresser is a big pain in the ass;
especially if you're wet grinding.
You might also consider mounting a shadowgraph above the wheel.
That way you can check the profile right as you dress it.
Cheers

Marcus
-----Original Message-----
From: jvicars@... <jvicars@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
Date: Friday, March 09, 2001 3:51 AM
Subject: [CAD_CAM_EDM_DRO] Profile Grinding

>Good morning gentelmen and ladies. I am introducing what I believe to
>be a new topic for this list. The work I am doing now has lead me in
>the direction of needing a surface grinder in my shop, and after
>watching one of our suppliers use his new 1Million dollar profile
>grinding machine I got the idea.
>CNC wheel profiling I understand is not a new Idea, but I have yet to
>hear of anyone doing it at home. The key to the solution is in the
>new dressing technique of using a diamond "saw" instead of the
>tradtional dressing "points". This very thin saw can be seen at
>
>http://nortonabrasives.com/industrial/asp/pdf/7554.pdf
>
>This allows you to get very steep convex/concave shapes with only 2
>axis control, just like a conventional lathe. The most common use
>today is grinding gear teeth.
>The high dollar machines profile on the side of the wheel vs. the
>bottom, and they keep their reference by having encoder feedback on
>the horizontal table. The proceedure is to grind and then re-dress
>the wheel at even intervals while moving the grinding head down to
>compensate for the removed material.
>
>For the home shop you essentialy would be building a toolpost grinder
>monted to an xy table. Then you get one of these diamond saws and
>you control the dresser just like a lathe.
>
>The only problem I can think of right now is that you would have to
>grind on the bottom of the wheel using the grinder's Z for reference.
> So your table would really be a YZ control. Some of the things that
>make this very attractive project are the small range of motion, low
>cutting forces, high resolution. You should be able to use fairly
>small motors and components making the project cost efficient too.
>
>Anyone who has any thoughts or experience please reply. I have very
>little exposure to grinding in general and would like to do more
>investigation before I dive in to build this thing. I will be using
>it to grind convex clyindrical "pads" that resemble the cam followers
>on a rocker lever.
>
>
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