Oh to answer your question: 1 to get a quieter drive, the vari-speed is very noisy even with new everything. 1a the vari-speed drive goes from 500-4200 RPM but over 2k you can't stand to be in the shop with it. 2 to be able to set my RPM from 175-5200 with S in g code. 3 did I mention how noisy the vari-speed drive is?
JT On 8/23/2013 10:44 AM, Jon Elson wrote: > John Thornton wrote: >> I have a BP Series 1 knee mill with an Anilam 3 axis CNC conversion and >> a Kwik Switch spindle on it that now runs with LinuxCNC. I have a >> GS2-23PO 3hp AC drive for the spindle. I recently added a 2500 line >> encoder to the spindle and can now rigid tap. >> >> http://www.automationdirect.com/adc/Shopping/Catalog/Drives/GS2_%28115_-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control%29/GS2_Drive_Units_%28115_-z-_230_-z-_460_-z-_575_VAC%29/GS2-23P0 >> >> Right now I have the original 1 1/2 hp BP motor and the vari-speed head >> on it. So I've been running it at 1800 RPM and using the vari-speed to >> change spindle RPM which can be a bit of a pain when swapping back and >> forth from drilling to tapping. >> >> The thought came to me yesterday after remembering my buddy had one of >> his BP's converted to a timing belt drive and a VFD for speed control. I >> found a 2 hp 3600 RPM inverter duty motor for $440 at automation direct. >> >> http://www.automationdirect.com/adc/Shopping/Catalog/Motors/AC_Motors_-_General_Purpose_and_Inverter_Duty_%280.25_-_300HP%29/AC_Motors_-_Inverter_Duty,_Marathon_%280.25_-_100HP%29/Marathon_Inverter_Duty_Motors_%28by_HP%29/E2006 >> >> The specs say the motor will run from 350 RPM to 7200 RPM. If I gear it >> at 1.4:1 I can get 250 RPM to 5142 RPM which the spindle should do as it >> can do 4200 RPM now. I can tap at 250 RPM and do that now. >> >> Have I missed anything? Is this a bad plan? >> > Why change the motor? I do rigid tapping with the stock 1 Hp motor on > my 1J Bridgeport at 20% speed (12 Hz). I can do this all day long with > several spindle reversals a minute with no detectable motor heating. > > I leave the belt on the highest speed setting so the inertia of > reversing the > motor is minimized. For bigger taps, it would be needed to change the belt > for reduction. This is the 1J head with 4 step-pulley speeds plus the > back gear. > > Jon > > ------------------------------------------------------------------------------ > Introducing Performance Central, a new site from SourceForge and > AppDynamics. Performance Central is your source for news, insights, > analysis and resources for efficient Application Performance Management. > Visit us today! > http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Introducing Performance Central, a new site from SourceForge and AppDynamics. Performance Central is your source for news, insights, analysis and resources for efficient Application Performance Management. Visit us today! http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
