On Apr 12, 2009, at 12:24 AM, Kirk Wallace wrote: > On Sat, 2009-04-11 at 23:32 +0200, Dirk wrote: >> On Apr 11, 2009, at 11:05 PM, Kirk Wallace wrote: > ... snip >>> >>> Your Z looks like a big improvement. I was thinking you could >>> replace >>> the round column with a square one like this: >>> http://www.harborfreight.com/cpi/photos/93800-93899/93885.gif >> >> The stage I have was a leftover from work. :-) > > Actually this is more what I had in mind: > http://www.wallacecompany.com/machine_shop/mini-mill_Z.png > > This would need a rectangular steel tube, some steel plate and a > welder. > Although the construction on my machine is not ideal, it is stiff enough. The z-stage is not connected to the original steel tube. There is a massive 60x60 mm stainless steel rod behind it. (another leftover piece of material)
>> I found some HF spindles. I like that they are really compact. I >> don't >> like the price. But what I really see as a problem is that they only >> have a limited speedrange. From very fast to ultra fast. You need >> very >> small carbide cutters with that. > > I'm not sure why you would want another spindle. > Forgot to mention it in the original post. The spindle is very noisy and speedrange is limited. But, I am most concerned about the plastic gears inside. They are not very strong. So far I didn't have any troubles but I am not sure about the lifespan of these gears. I would really like to skip the gears and drive the spindle directly. A new motor which would be a direct replacement is by far the easiest. But this is also an opportunity to improve the spindle. >> Another thing that might be an option is a 3 phase motor with a >> frequency controller. The controller won't be cheap, but I guess the >> motor won't be expensive or hard to find. >> >> Dirk > > It looks like you have some options for 3-phase: > > http://cgi.ebay.nl/ws/eBayISAPI.dll?ViewItem&item=250402814683 > http://cgi.ebay.nl/ws/eBayISAPI.dll?ViewItem&item=200328530280 > > http://cgi.ebay.nl/ws/eBayISAPI.dll?ViewItem&item=400042726062 > http://cgi.ebay.nl/ws/eBayISAPI.dll?ViewItem&item=400041004985 > > If you want to hook it to EMC2: > http://www.wallacecompany.com/machine_shop/EMC2/serial_dac/ Kirk, you really spell it out for me! Thanks! But....the first motor weighs 22 kg! And that is another problem. My z-stage stepper won't handle that. Dirk ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
