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Messages - Sam

Crazy ain't it!!! Hopefully we can come back in another 11 and say the same thing.

Thanks for reporting back your findings!

General Mach Discussion / Re: Circles Not Round
« on: December 25, 2018, 12:03:43 AM »
Usually when you have errors that are 180 degrees apart, it's an indicator of backlash. The machine gets under a load and 'pulls' the lash out, then when it gets around to the opposite side it 'pushes' the lash out. My older machine does the same thing at 10 and 4 'o clock positions. I do what Steve suggest and do a couple spring passes, and it never gets under enough load to push or pull the lash. When this no longer works, or I get so sick of fighting it, it's time to do proper maintenance and fix it.

Show"N"Tell ( Your Machines) / Re: My Shizouka AN-S
« on: August 02, 2015, 11:37:43 AM »
There is an "Additional Options" link at the bottom left, when your typing your post. Please resize pictures if needed, so the picture does not fill up three football fields, and so the dial-up users are able to enjoy them as well. Thank you for sharing! We love pics :)

General Mach Discussion / Re: Machine goes wild with uncontrolled jog
« on: August 01, 2015, 03:59:00 PM »
It did not happen to me, when using PP.

General Mach Discussion / Re: Machine goes wild with uncontrolled jog
« on: August 01, 2015, 07:56:19 AM »
Runaway has been a problem for a LONG while now. I always use the keyboard for input, so it has bit me many times. It bothers me so much, I will not let anybody run the machine, unless it's just **open vise, change part, hit GO button. Rinse. Repeat.** I HATE this bug. http://www.machsupport.com/forum/index.php/topic,24665.10.html

Tangent Corner / Re: We all make mistakes.
« on: October 01, 2014, 05:15:18 PM »
where have you been hiding
Yeah, I've been MIA for a bit. Been kinda super busy lately. Quit a job of 14 years, started building a new house, and shop, been busy in my current shop, started a new job, the list goes on. Maybe it will slow down a bit come winter. New shop is not a monster by any means, but it should hold enough equipment into the foreseeable future. At least I can fit a machine thru the door on this shop.

Tangent Corner / Re: We all make mistakes.
« on: September 28, 2014, 08:18:34 PM »
I'll be darned. Ya learn something new every day. Thanks for sharing that one Tweaks!

General Mach Discussion / Re: dumb question
« on: September 07, 2014, 11:26:16 AM »
Crap.....I came here looking for a dumb question. That was not dumb at all. It did not un-impress any of us. Try harder, Mike. Your lack of effort is, well....unimpressive.  ;D

My backlash for 1" moves of 40" moves is within 0.0002" repeatability
Not exactly sure what you mean, but I think you mean 1" moves, repeated 40 times. Repeatability and backlash are two separate things. Think of repeatability as positional accuracy over a number of cycles. Backlash is the free play, or gap, between drive components when there is a change in direction. There can be a massive amount of backlash, and you can still have superb repeatability.
whether it's a 1" diameter circle or a 8" circle... they are all out of round by 0.030"
Davek0974's advise is great, and you should do that, however, you state that the deviated amount is the same, regardless of circle diameter. If the motors steps per unit were off, the deviation would not be consistent on different sized circles. Sounds like backlash now. That does not mean that your steps per unit are correct, and you should still check it. As Dave stated, use as long of a distance as possible. If you have a set of 6" calipers, use those. If you have 12", use those instead. Remember, move enough distance to take the lash out, and then measure in that same direction.
one circle seemed to start and stop a lot, while others were a continuous motion/sound
Most likely, the machine is doing exactly as the code is telling it to. There is nothing indicating a problem with the machine by this. The start/stop is segmented code (less than desirable in my opinion) being executed (G1), and the other pass is using circular interpolation (G2,G3). You can take a look at the code to verify. The reason behind the code being generated as segments, can be vast. There might be a setting in your CAM program that can have an impact on this.
should my dual motor Y axis acceleration setting be.....
When your trying to remedy a problem such as this, I would turn the accel down, to eliminate it from the equation. Turning it up may just introduce a new problem into the mix and make confusion/aggravation shoot through the roof. You can always tweak the accel later on, when the problem is fixed.