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synthetos / TinyG

Affordable Industrial Grade Motion Control
https://github.com/synthetos/TinyG/wiki
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Zero backoff distance when homing appears to be wrong #146

Closed rickcaddell closed 8 years ago

rickcaddell commented 8 years ago

This is firmware I am using. [fb] firmware build 440.20 [fv] firmware version 0.97 [hp] hardware platform 1.00 [hv] hardware version 8.00 [id] TinyG ID 3X3566-JUU ... tinyg [inch]

The Zero back off value is 0.1 inch. (set using JSON command {xzb:0.1}) The units mode is set to inch.

When I initiate a home sequence with a zero back off value of 0.1 inch , the machine actually backs off 2.5 inches or so. If I set the zero backoff to 0.004 (0.1 / 25.4) it backs off about 0.1 inch.

It appears that there is some mixup with metric units.

aldenhart commented 8 years ago

Thanks for the tip. Looking into it.

rickcaddell commented 8 years ago

Something odd is going on. I have two TinyG's. One in my lab that is connected to a couple of motors and switches that I use for testing, and one on a machine in my shop (which I just got running). Both machines have the same firmware build, firmware version, hardware platform and hardware version. The lab machine does not do the back off correct, but the shop machine does.Not sure what is going on here.

ril3y commented 8 years ago

rickcaddell,

The configs are the same? We really would need some more information on what is going on. I would say that (having done this exact thing) is one tinyg is wired correctly and one is not. Perhaps one of the switches is bad?

On Sun, Dec 6, 2015 at 10:02 AM, rickcaddell notifications@github.com wrote:

Something odd is going on. I have two TinyG's. One in my lab that is connected to a couple of motors and switches that I use for testing, and one on a machine in my shop (which I just got running). Both machines have the same firmware build, firmware version, hardware platform and hardware version. The lab machine does not do the back off correct, but the shop machine does.Not sure what is going on here.

— Reply to this email directly or view it on GitHub https://github.com/synthetos/TinyG/issues/146#issuecomment-162322518.

rickcaddell commented 8 years ago

The configs are definitely the same, and I checked the switch. The TinyG that does not seem to work is an older one, and

I did have problems flashing it to the latest version, maybe it did not entirely reprogram, or there is something wrong with

the hardware.

I would not spend any more time on this right now, one board works so your software is probably OK.

I will re-flash and retest, and if need be try the old board on my shop machine and let you know if it still does not work.

Rick

From: ril3y [mailto:notifications@github.com] Sent: Sunday, December 06, 2015 10:28 AM To: synthetos/TinyG Cc: rickcaddell Subject: Re: [TinyG] Zero backoff distance when homing appears to be wrong (#146)

rickcaddell,

The configs are the same? We really would need some more information on what is going on. I would say that (having done this exact thing) is one tinyg is wired correctly and one is not. Perhaps one of the switches is bad?

On Sun, Dec 6, 2015 at 10:02 AM, rickcaddell notifications@github.com wrote:

Something odd is going on. I have two TinyG's. One in my lab that is connected to a couple of motors and switches that I use for testing, and one on a machine in my shop (which I just got running). Both machines have the same firmware build, firmware version, hardware platform and hardware version. The lab machine does not do the back off correct, but the shop machine does.Not sure what is going on here.

— Reply to this email directly or view it on GitHub https://github.com/synthetos/TinyG/issues/146#issuecomment-162322518.

— Reply to this email directly or view it on GitHub https://github.com/synthetos/TinyG/issues/146#issuecomment-162323663 .Image removed by sender.