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

Dave M

When I plasma cut a part that was 10mm thick. One lot of sides of the part
had beautiful cut edges. The other sides which the x axis cut were a lot
rougher than the y axis cut edges.

This pretty much makes me believe that the DRO might be giving a correct
reading.

I will put a pen in the machine tomorrow and draw a couple of 45'ers and see
how they go.

The motors step rate's etc have all been tuned good.

Peter

----- Original Message -----
From: "caedave" <caedave@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, December 22, 2005 10:15 PM
Subject: 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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>>
>>
>>
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> 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:
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> 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........
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> List Mom
> List Owner
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>
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