Dynomotion

Group: DynoMotion Message: 4208 From: himykabibble Date: 3/11/2012
Subject: Perplexing Problem....
I'm having a strange problem with my Z axis. I use probing to set the Z offset, and the probing result seems 100% consistent and repeatable. I can probe, zero the Z axis to the top of work, then move the Z axis up, and back down to +0.063, and the touchplate slips nicely under the tool. I can re-home the Z axis, move back down to +0.063, and the touchplate slips nicely under the tool. I can repeat this as many times as I like. But, if I then move to -0.100, and do a short cut, the cut depth is consistently about 0.010" too deep, and I then have to move up to 0.073" for the touchplate to be able to again slip under the tool. So, it's acting like the Z offset has changed, but it hasn't. I can even re-home at this point, and the 0.010" offset is still there! Where is that 0.010" offset coming from? There is essentially no backlash (<0.0005"). What's going on here?

Regards,
Ray L.
Group: DynoMotion Message: 4209 From: himykabibble Date: 3/11/2012
Subject: Perplexing Problem....
I'm having a strange problem with my Z axis. I use probing to set the Z offset, and the probing result seems 100% consistent and repeatable. I can probe, zero the Z axis to the top of work, then move the Z axis up, and back down to +0.063, and the touchplate slips nicely under the tool. I can re-home the Z axis, move back down to +0.063, and the touchplate slips nicely under the tool. I can repeat this as many times as I like. But, if I then move to -0.100, and do a short cut, the cut depth is consistently about 0.010" too deep, and I then have to move up to 0.073" for the touchplate to be able to again slip under the tool. So, it's acting like the Z offset has changed, but it hasn't. I can even re-home at this point, and the 0.010" offset is still there! Where is that 0.010" offset coming from? There is essentially no backlash (<0.0005"). What's going on here?

Regards,
Ray L.
Group: DynoMotion Message: 4210 From: Tom Kerekes Date: 3/11/2012
Subject: Re: Perplexing Problem....
Hi Ray,
 
I don't know, but you might go through the steps step-by-step while recording the KMotion Axis Screen Destinations to check where things are being commanded in raw machine counts.  Also describe what you mean by "do a short cut".
 
Regards
TK

From: himykabibble <jagboy@...>
To: DynoMotion@yahoogroups.com
Sent: Sunday, March 11, 2012 12:28 PM
Subject: [DynoMotion] Perplexing Problem....

 
I'm having a strange problem with my Z axis. I use probing to set the Z offset, and the probing result seems 100% consistent and repeatable. I can probe, zero the Z axis to the top of work, then move the Z axis up, and back down to +0.063, and the touchplate slips nicely under the tool. I can re-home the Z axis, move back down to +0.063, and the touchplate slips nicely under the tool. I can repeat this as many times as I like. But, if I then move to -0.100, and do a short cut, the cut depth is consistently about 0.010" too deep, and I then have to move up to 0.073" for the touchplate to be able to again slip under the tool. So, it's acting like the Z offset has changed, but it hasn't. I can even re-home at this point, and the 0.010" offset is still there! Where is that 0.010" offset coming from? There is essentially no backlash (<0.0005"). What's going on here?

Regards,
Ray L.
Group: DynoMotion Message: 4211 From: himykabibble Date: 3/11/2012
Subject: Re: Perplexing Problem....
Tom,

I'll give that a try. AFAICT, It's been doing this since I started using the KFlop, only on the Z axis. Very weird.

By "do a short cut" I mean I cut some metal - about an inch long cut, so I can measure the depth.

Regards,
Ray L.

--- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@...> wrote:
>
> Hi Ray,
>  
> I don't know, but you might go through the steps step-by-step while recording the KMotion Axis Screen Destinations to check where things are being commanded in raw machine counts.  Also describe what you mean by "do a short cut".
>  
> Regards
> TK
>
>
> ________________________________
> From: himykabibble <jagboy@...>
> To: DynoMotion@yahoogroups.com
> Sent: Sunday, March 11, 2012 12:28 PM
> Subject: [DynoMotion] Perplexing Problem....
>
>
>  
>
> I'm having a strange problem with my Z axis. I use probing to set the Z offset, and the probing result seems 100% consistent and repeatable. I can probe, zero the Z axis to the top of work, then move the Z axis up, and back down to +0.063, and the touchplate slips nicely under the tool. I can re-home the Z axis, move back down to +0.063, and the touchplate slips nicely under the tool. I can repeat this as many times as I like. But, if I then move to -0.100, and do a short cut, the cut depth is consistently about 0.010" too deep, and I then have to move up to 0.073" for the touchplate to be able to again slip under the tool. So, it's acting like the Z offset has changed, but it hasn't. I can even re-home at this point, and the 0.010" offset is still there! Where is that 0.010" offset coming from? There is essentially no backlash (<0.0005"). What's going on here?
>
> Regards,
> Ray L.
>