Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Posted by
steveggca
on 2002-04-25 16:36:23 UTC
Hmmm sounds a bit like backlash compensation remove whatever values
are set for compensation now and set to "0" repeat the test that you
did
are set for compensation now and set to "0" repeat the test that you
did
--- In CAD_CAM_EDM_DRO@y..., "Alex Canale" <alex.canale@r...> wrote:
> Hi Jon, and everybody else who kindly answered!
>
> I did a series of measurements with the dial indicator in the X
and Y axis.
> These are the results:
>
> Location: approx. towards center of table
> All movements were done with a feed of 2IPM.
>
> Y-axis
> Screen display Indicator Reading
> .5000 .4950 (.0050)
> .2500 .2445 (.0045)
> .1000 .0960 (.0040)
> .0500 .0460 (.0040)
> .0250 .0205 (.0045)
> .0100 .0060 (.0040)
> .0050 .0010 (.0040)
> .0010 .0000
>
> X-axis
> Screen Display Indicator Display
> .5000 .4985 (.0015)
> .2500 .2490 (.0010)
> .1000 .0990 (.0010)
> .0500 .0490 (.0010)
> .0250 .0235 (.0015)
> .0100 .0090 (.0010)
> .0050 .0035 (.0015)
> .0010 .0000
>
> I went ahead and ran the same test on another part of the table
> Location: Top Right Corner of Table
>
> Y-axis
> Screen Display Indicator Reading
> .5000 .4955 (.0045)
> .2500 .2450 (.0050)
> .1000 .0960 (.0040)
> .0500 .0460 (.0040)
> .0250 .0210 (.0040)
> .0100 .0065 (.0035)
> .0050 .0020 (.0030)
> .0010 .0000
>
> X-axis
> Screen Display Indicator Reading
> .5000 .4995 (.0020)
> .2500 .2480 (.0020)
> .1000 .0980 (.0020)
> .0500 .0480 (.0020)
> .0250 .0230 (.0020)
> .0100 .0080 (.0025)
> .0050 .0030 (.0020)
> .0010 .0000
>
> I'm not very sure if this is a problem of excess table wear
because the
> problem does not seam to diminish when the table is moved. Also
when ever I
> would bring the table back to x0 y0 the reading on the indicator
would be
> "dead nuts" zero! It's almost like the ball screw would shift on
it's axis a
> little bit until it would engage the table and start moving it.
>
> I did try to measure the backlash as you described I zeroed out
the table in
> "X" and then I moved it an inch with the indicator on one side I
measured
> the the difference in the indicator to be .0025" Then I zeroed the
table
> again (brought back to the zero position) moved the indicator to
the other
> side and displaced the table an inch in the other direction and
measured the
> difference to be .0030". Does this mean that the backlash
is .0055"? If it
> is WOW!!!!
>
> I haven't done any of the other measurements for the runout on the
> head/spindle. Partly because I don't understand half the stuff
that you told
> me (sorry I'm still climbing the ste learning curve)and also
because I
> wanted to deal with the table issues first. But Answering your
question
> about the tilt head, yes it does have one, and I have indexed it
before but
> i suspect it is not quite right yet. I used the top of the vise to
index it.
>
> With respect to the gauge blocks......well I think I'm gonna have
to ask
> that one again 'cause that was way over my head.
>
> Now back to the table problem. I checked the belt on the y-axis
and it seams
> to be ok, other than it needs a little lubrication. There is no
noticeable
> slop or play. In another mail, some suggested that the thrust
bearing could
> be the culprits or also the screws that secure the ball nuts. How
can I
> check for these guys and where can I finde them.
>
> Also is there a service manual for these things, or would that be
pretty
> much a fossil.
>
> Thanks, Jon and everybody else that replied, you guys are great
help.
>
> Dead in the water, Alex
>
>
>
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Discussion Thread
sleyed
2002-04-24 22:40:40 UTC
Surface grinder semi-automation
Alex Canale
2002-04-25 06:50:40 UTC
RE: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Marcus & Eva
2002-04-25 07:24:02 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Jon Anderson
2002-04-25 07:55:36 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Jon Elson
2002-04-25 10:43:01 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Bill Vance
2002-04-25 11:00:09 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
steveggca
2002-04-25 12:21:56 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Alex Canale
2002-04-25 15:00:20 UTC
RE: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
scott wilson
2002-04-25 15:08:02 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Tim Goldstein
2002-04-25 15:18:28 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
steveggca
2002-04-25 16:36:23 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Carlos Guillermo
2002-04-25 17:30:35 UTC
RE: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Alex Canale
2002-04-26 10:37:09 UTC
RE: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
baumanro2000
2002-04-26 18:59:26 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Marcus & Eva
2002-04-26 19:45:05 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Jon Anderson
2002-04-26 20:01:14 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Brian Alley
2002-04-27 07:02:45 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Alex Canale
2002-04-29 07:50:18 UTC
RE: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Brian Alley
2002-04-29 17:14:42 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport
Jon Elson
2002-04-29 22:45:25 UTC
Re: [CAD_CAM_EDM_DRO]Backlash & Wobbly Spindle on my Bridgeport