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Mach Discussion => General Mach Discussion => Topic started by: tjhj on March 13, 2010, 01:04:40 PM

Title: Tormach TTS Belleville Spring Washer Deflection (Not Force)
Post by: tjhj on March 13, 2010, 01:04:40 PM
Hi All,

After reading as much as I can, and reading through all of the thread
What The World's Been Waiting For - Yet Another Power Drawbar Design
http://www.machsupport.com/forum/index.php/topic,11826.0.html

An interesting discussion on how much tension force is needed.

But my big question is how much total deflection is needed?

If anyone is using a TTS ATC System, how much travel in the spring washers is needed to ensure a good tool release?

Thank you for your time,

TJ
Title: Re: Tormach TTS Belleville Spring Washer Deflection (Not Force)
Post by: HimyKabibble on March 13, 2010, 03:55:11 PM
0.100" is plenty.  0.050" will do it in most cases.

Regards,
Ray L.
Title: Re: Tormach TTS Belleville Spring Washer Deflection (Not Force)
Post by: tjhj on March 14, 2010, 01:20:51 PM
I guessed correct. Now that's just odd.

Thank you for your time.
TJ
Title: Re: Tormach TTS Belleville Spring Washer Deflection (Not Force)
Post by: zephyr9900 on March 15, 2010, 03:45:04 PM
Ray, did you ever post pictures of your final configuration?

Randy
Title: Re: Tormach TTS Belleville Spring Washer Deflection (Not Force)
Post by: HimyKabibble on March 15, 2010, 09:38:15 PM
Quote from: zephyr9900 on March 15, 2010, 03:45:04 PM
Ray, did you ever post pictures of your final configuration?

Randy


Randy,

Not really.  I abandoned the Belleville drawbar, because it just wasn't practical to get enough tension to properly hold a tool in a collet.  For a while, I used an impact wrench drawbar, but HATED the racket, and the wear on the drawbar and socket, so I removed it after a few months.  My "final" approach is a stepper motor with planetary gear reducer.  This will provide MORE than enough torque (up to 75 ft-lbs!), and allow the drawbar to be loosened just a few turns (for Tormach-style holders), or unscrewed completely, under software control.  But, as I've just returned to work, following 19 months of unemployment, I have very little time to get out to the shop.....

Regards,
Ray L.
Title: Re: Tormach TTS Belleville Spring Washer Deflection (Not Force)
Post by: zephyr9900 on March 15, 2010, 10:37:48 PM
Quote from: HimyKabibble on March 15, 2010, 09:38:15 PM
But, as I've just returned to work, following 19 months of unemployment, I have very little time to get out to the shop....
Good on ya, Ray!  I hope to be in that position myself really soon now (17 months and counting of unemployment for me...)

I think yours is the first motor-driven drawbar that I've heard of.  Scott_M over on CNCZone has a new handlever-operated hydraulic-force-multiplier TTS drawbar, but of course the Tormach doesn't have a quill...

Randy
Title: Re: Tormach TTS Belleville Spring Washer Deflection (Not Force)
Post by: Overloaded on March 15, 2010, 11:31:40 PM
Very interesting.....
http://cnczone.com/forums/showthread.php?t=100231
Thanks Randy
Title: Re: Tormach TTS Belleville Spring Washer Deflection (Not Force)
Post by: HimyKabibble on March 16, 2010, 10:19:22 AM
Quote from: zephyr9900 on March 15, 2010, 10:37:48 PM
Quote from: HimyKabibble on March 15, 2010, 09:38:15 PM
But, as I've just returned to work, following 19 months of unemployment, I have very little time to get out to the shop....
Good on ya, Ray!  I hope to be in that position myself really soon now (17 months and counting of unemployment for me...)

I think yours is the first motor-driven drawbar that I've heard of.  Scott_M over on CNCZone has a new handlever-operated hydraulic-force-multiplier TTS drawbar, but of course the Tormach doesn't have a quill...

Randy


Randy,

Yes, no quill makes it a LOT easier.  I wonder how that lever-operated one will wear with use.  There's a LOT of pressure on those little cams and levers.  It wouldn't surprise me if they wore and loosened up over time.  Very nice execution though!

Regards,
Ray L.