Re: [CAD_CAM_EDM_DRO] Re: First machine/plans recommendation?

On Fri, 18 Jul 2003 16:52:59 -0000, you wrote:

>Thanks Harvey, I don't have any machining tools at the moment so
>that design is beyond my means.

It took a bit. the easiest way is to go with linear bearings, but
that's really throwing money at it. This was the least expensive way
that I could think of that would work, and still give me a hand at
precision. On the other hand, the Z axis is made up of linear
bearings, cost lots more, and was built in far less time.

>Once I get a learning machine built
>though, I plan to use it to build parts for the "real" machine.
>There are some very good insights in your description which should
>help me though both stages.

Glad to help.

The boards are home built, done with Eagle Cad, and built on an L297
and L298 chipset. I found that there needs to be a filter in the
current sense loop to eliminate singing in the motors. The app notes
from ST detail this.

>
>Not that I can't work metal. In the Navy I was a marine engineer.
>Our fitting/machinist courses totalled about 9 months using
>hacksaws, files, a drill press and a blueing plate and 6 months
>using a lathe. I think I got 2 hours on a milling machine total! No
>mills on the ships so we learned filing *real* good. Built a
>sterling heat engine, 80% by hand.

This is right at the limit of a somewhat larger drill press, and the
HF/Grizzly/Homier mini-mill and mini-lathe. I do admit to having a
rotary table (6 inches) which has quite simplified making motor
mounting plates.

Good luck, and please keep me informed.

I do plan to update the website, but the problem is that I am fast
running out of web space.

Harvey

>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Harvey White <madyn@i...>
>wrote:
>>
>> Bits and pieces are documented on www.netcom.com/~madyn go to
>> electronics then xyzr table.
>>
>> The whole thing is built, and is running off a laptop. Considering
>> that the only thing I did not build was the laptop, the stepper
>> motors, and the linear and ball bearings (and leadscrews), I
>suppose
>> it would be home brew enough. Machine has roughly a 7 inch cubical
>> envelope, 4 axis (x, y z, and r). Mods are still in process,
>though.
>>
>> Harvey
>>
>>
>> >
>> >Thanks!
>> >
>> >
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>Addresses:
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>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>bill
>List Mom
>List Owner
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