RE: [CAD_CAM_EDM_DRO] Positioning
Posted by
Tony Smith
on 2014-06-03 12:11:47 UTC
Hanero is a bullshit artist - the perfect example of "talk is cheap".
When asked for photos or details of the machines or items he claims he makes....
Tony
(One day we'll take up a collection to buy him a camera. No doubt his dog will eat that one too)
(Hey Ballendo, is that you?)
When asked for photos or details of the machines or items he claims he makes....
Tony
(One day we'll take up a collection to buy him a camera. No doubt his dog will eat that one too)
(Hey Ballendo, is that you?)
> Being right or not, being a jerk and getting personal takes away from your
> credibility.
>
>
> Focus on the issues, not the person.
>
>
> I'll now return to lurking mode.
>
>
>
>
> Christopher Erickson
> Consulting Engineer
> Summit Kinetics
> Waikoloa, HI 96738
> www.summitkinetics.com
>
>
>
>
>
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com]
> Sent: Monday, June 02, 2014 11:02 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Positioning
>
>
> Capacitive type scales are cheap because of the way they are manufactured,
> that doesn't not affect their accuracy.
>
>
>
>
>
> It's the same reason why bolts are cheaper than nuts - you can forge and
> roll the thread on a bolt, while you need to cut the thread on a nut. The
> operations to make a bolt are cheaper than making the nut for it.
>
>
>
>
>
> Most capacitive scales have a resolution of 0.0005" of an inch, and can be
> made to measure less than that. Yes, even under a micron (and mostly better
> electronics, btw).
>
>
>
>
>
> If you have a source for their inaccuracy (apart from your rather fertile
> imagination) let's see it. 0.04mm? Hah.
>
>
>
>
>
> Capacitive scales have two drawbacks - they're affected by oil & crud and
> have slow-ish data rates (50 readings per second?). Doesn't stop people
> using them though. The 'jitter' people find with those scales is power
> supply problems, usually caused when powered from a DRO rather than
> battery.
> Or RF, but that happens to everything.
>
>
>
>
>
> If you bothered to calculate the thermal coefficient of your 600mm screw,
> you'd find for every degree (Celcius) change in temperature it will expand
> by that micron you claim to machine all of your parts to (including those
> "high-precision" spanners you were going to make - your funniest post ever).
>
>
>
>
>
> Unless you have a temperature controlled room (to a degree!) AND are
> keeping
> every part of your machine at that temperature, your parts are not the size
> you imagine they are. And don't forget your scales are change shape at a
> different rate. Oh, and of course your screws are liquid cooled as well.
>
>
>
>
>
> Sure, add scales. In theory they should tell you where everything thing is
> (you believe the brochure?), in practice close enough. I realise that's
> unsuitable for the fantasy-land you do your machining in, but anyway.
>
>
>
>
>
> Machines with backlash shake themselves apart? Lol.
>
>
>
>
>
> You really should do some machining one day, you might learn something.
>
>
>
>
>
> Tony
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com]
> Sent: Tuesday, 3 June 2014 6:10 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Positioning
>
>
>
>
>
> The specs on the screw accuracy are irrelevant.
> What IS relevant is that there be no slop, as a machine with dual-feedback,
> ie glass scales, will shake itself to pieces is it has backlash.
>
>
> Thats why you cannot use the crap chinese scales, because they are off, ie
> inaccurate, by upto 0.00" or 0.04 mm, in short distance, and the error
> varies.
> So using such, would make the machine jitter (sometimes, in some places).
>
>
> This causing back-and forth motion, upto hundreds of times a second,
> depending on how fast the secondary positoning error-correction mechanism
> is.
>
>
> It is impossible to make a (working) secondary-feedback mechanism if you
> have backlash in the system.
>
>
> Tony..
> Unlike some people here, I try to be factual and polite.
> Grin.
>
>
> Re: screw accuracy.
> Everything is inaccurate. Its just a question of how much.
> One good part about glass scales, is that they are usually accurate (to 1
> micron, or down to 0.01 micron with some Mori Seiki machines).
>
>
>
>
>
>
>
>
>
>
>
> Sure, when you read the specs on the average screw, and that "Dummies Guide
> To Fantasy Machining" you've got.
>
>
> Do you know what a drunken thread is?
>
>
> Do you know what a temperature coefficient is? (Go work out the expansion on
> a 600mm steel screw for a 1 degree delta.)
>
>
> Tony
>
>
> (You and your microns, lol)
>
>
>
>
>
>
>
>
>
>
> --
> -hanermo (cnc designs)
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
>
> ------------------------------------
> Posted by: "Tony Smith" <ajsmith1968@...>
> ------------------------------------
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
> wanliker@...,
> timg@...
> Moderator: pentam@... indigo_red@...
> davemucha@...
> [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
>
> 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
>
>
> Yahoo Groups Links
>
>
>
>
>
>
>
>
> ------------------------------------
> Posted by: "Christopher Erickson" <christopher.k.erickson@...>
> ------------------------------------
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
> wanliker@..., timg@...
> Moderator: pentam@... indigo_red@...
> davemucha@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> 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
>
> Yahoo Groups Links
>
>
>
Discussion Thread
David G. LeVine
2014-06-01 14:52:58 UTC
Positioning
Hannu Venermo
2014-06-02 04:31:36 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Tony Smith
2014-06-02 05:55:45 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Hannu Venermo
2014-06-02 22:08:15 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Tony Smith
2014-06-02 22:46:24 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Hannu Venermo
2014-06-03 01:10:22 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Tony Smith
2014-06-03 02:02:35 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Keith Burton
2014-06-03 03:35:10 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Tony Smith
2014-06-03 06:40:53 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Hannu Venermo
2014-06-03 09:46:21 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
John Anhalt
2014-06-03 10:28:10 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Christopher Erickson
2014-06-03 10:31:22 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
CS Mo
2014-06-03 10:38:42 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Jon Elson
2014-06-03 11:02:30 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
CS Mo
2014-06-03 11:19:27 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Tony Smith
2014-06-03 12:11:47 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Andy Wander
2014-06-03 12:42:29 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Tony Smith
2014-06-03 13:39:23 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Randall Wink
2014-06-03 14:48:12 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Jon Elson
2014-06-03 19:42:16 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
William Thomas
2014-06-03 19:55:50 UTC
[CAD_CAM_EDM_DRO] Positioning
Jon Elson
2014-06-03 21:14:51 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
William Thomas
2014-06-04 10:30:56 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Tony Smith
2014-06-07 10:36:28 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Hannu Venermo
2014-06-07 10:52:15 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Steve Blackmore
2014-06-08 00:42:15 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Hannu Venermo
2014-06-08 23:26:25 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
David G. LeVine
2014-06-09 10:48:55 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Steve Blackmore
2014-06-09 15:51:45 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
David G. LeVine
2014-06-10 22:11:27 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Steve Blackmore
2014-06-10 23:32:12 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
David G. LeVine
2014-06-12 15:55:17 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Steve Blackmore
2014-06-12 23:30:32 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Christopher Erickson
2014-06-18 15:43:45 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Christopher Erickson
2014-06-18 15:44:17 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
Tony Smith
2014-06-18 15:44:45 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
John Anhalt
2014-06-18 15:45:06 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
ED MAISEY
2014-06-18 15:45:49 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
Christopher Erickson
2014-06-18 15:45:55 UTC
RE: [CAD_CAM_EDM_DRO] Positioning
David Mannock
2014-06-18 15:46:04 UTC
Re: [CAD_CAM_EDM_DRO] Positioning
David G. LeVine
2014-06-20 15:33:34 UTC
Re: [CAD_CAM_EDM_DRO] Positioning