Re: [CAD_CAM_EDM_DRO] Why does my X axis go faster than my Y axis????

Indicated vs. actual i.e. are these figures the machine is telling you or
have
you actually measured them. If your taking them from the DRO then
there might not be an actual problem with the drive system but just a
mis-calibrated DRO.

The 45 degree cut I suggested will show if this mismatched feed rate
is producing a problem with the finished product.


Axis ratio's, no they don't need to be the same, but the control system
needs to be adjusted for this difference in order to drive them at the same
rate (different step rate for different ratio's). So you will need to tune
the
motors as said in a previous posting.

Dave M.

----- Original Message -----
From: "Peter Megan Isabella" <apalais@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, December 22, 2005 5:22 AM
Subject: Re: [CAD_CAM_EDM_DRO] Why does my X axis go faster than my Y
axis????


> When you say are these "indicated feed rates" or "actual measured feed
> rates", what do you mean?
>
> Basically if I process the g-code in SheetCam then open the .tap file in
> Mach3 and run it. The x axis will show that it is moving faster than what
> I
> have set it for in SheetCam. The DRO readout in Mach3 will show the "set
> feed" to be at say 1500mm/min but the "actual feed" DRO will show
> 1800mm/min.
>
>
> The x axis has a different gearing setup to the y axis.
>
> The x axis has a belt reduction setup where as the y axis is a direct
> drive.
> Will this matter?
>
> Do both axis have to have exactaly the same gear reduction/ratio's.?????
>
> Peter
> Australia
>
>
>
>
> ----- Original Message -----
> From: "caedave" <caedave@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Wednesday, December 21, 2005 11:45 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Why does my X axis go faster than my Y
> axis????
>
>
>> First question has to be, are these indicated feed rates or actual
>> measured
>> feed rates?
>>
>> If you program in a cut of 45 degrees at this feed rate and this error
>> shows, then a check
>> on the angle cut should show as NOT 45 degrees, indicating a disparity
>> between
>> the total drive ratio of the two axis which would give us a starting
>> point.
>>
>> The more info the better chance of an answer as this could be the result
>> of
>> mechanical,
>> electrical and or electronic problem.
>>
>> Dave M.
>>
>> ----- Original Message -----
>> From: "apples0_17" <apalais@...>
>> Subject: [CAD_CAM_EDM_DRO] Why does my X axis go faster than my Y
>> axis????
>>
>>
>>> When I cut a part out using Mach3 my x axis will move faster that the
>>> y axis.
>>>
>>> For example:
>>>
>>> I have used a basic shape that has a couple 90 degree corners and a
>>> diagonal back to the start point.
>>>
>>> The shape is set to cut at 1300mm/min.
>>>
>>> The y axis will cut at 1300mm/min, but when the machine turns a corner
>>> and the x axis starts moving. The feed rated goes over the set
>>> 1300mm/min up to 1800mm/min.
>>>
>>> Then turns a corner and back onto the y axis and it is fine at
>>> 1300mm/min again.
>>>
>>> When doing an angle say 45degrees, it will move at 1400mm/min.
>>>
>>> What is going on???
>>
>>
>>
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> [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
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>
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>
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Version: 7.1.371 / Virus Database: 267.14.3/209 - Release Date: 21/12/2005