Re: [CAD_CAM_EDM_DRO] Home built machine setup, perpendicularity

Is there an online reference to generating squares? Much to be found
with respect to falt surfaces and scrapping, someof which I've done
years ago, but i never learned how to generate a square.

Thanks
Dave


Leslie Watts wrote:

>Hi Scott
>
>I use a large 24" machinist's square and an indicator.
>
>SHARS used to sell these in accuracy class H in a fitted wooden case
>for only $99. I have lab grade granite surface plates and granite square to
>check
>these on and found them quite accurate...within tenths. You have to
>carefully control
>temperature to measure such things. I bought several.
>
>I checked their site to get a link for you but they seem to be out of stock.
>J&L has them but the price is $250 and they are advertised as only workshop
>grade...
>much poorer perhaps.
>
>You can play games with Pythagorus and such or generate three sets of
>precise squares
>if you have a very accurate surface plate but it takes a lot of time.
>
>Hmm....no economical large squares out there...I have thoughts of making
>some for sale. Perhaps 24x36" or 36x 48"? Class H? I could do that...
>but surely not for $100. Not $1000 or something like a Starrett either.
>
>Leslie M.Watts
>L M Watts Furniture
>Tiger Georgia
>(706) 212-0242
>
>Main page:
>http://www.lmwatts.com
>Engineering:
>http://www.lmwatts.com/shop.html
>Cnc surplus for sale:
>http://www.lmwatts.com/forsale.html
>Carved signs:
>http://www.lmwatts.com/signwp.html
>
>
>-----Original Message-----
>From: CAD_CAM_EDM_DRO@yahoogroups.com
>[mailto:CAD_CAM_EDM_DRO@yahoogroups.com]On Behalf Of Scott Riddle
>Sent: Thursday, July 07, 2005 9:59 AM
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: [CAD_CAM_EDM_DRO] Home built machine setup, perpendicularity
>
>
>I am looking to put together my own home built CNC machine with
>linear rails and ball screws onto a heavy tube frame. I am trying to
>figure out how to drive the main X axis which will move a gantry
>over the table. I am contemplating using 2 ball screws(smaller ones)
>to drive each set of trucks. This way I can assure no racking
>problems and have increased machine stiffness. My main questions is
>if I go to the 2 screw system and I am using stepper motors how do I
>initially when build this machine get my X and Y axis perpendicular?
>Assuming that each X and Y rail setup is straight to start with.
>
>Basically can I measure perpendicularity on a 3' x 3' linear rail
>setup with something like indicators. I do not have access to any
>large right angle plates or things like that. I would think that
>there would be some clever way to measure this.
>
>I used to design machine tools for several years so I know all the
>basics but when we did this setup part it was all done with a laser.
>
>Thanks
>Scott
>
>
>
>
>
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>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.
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>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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