# Motor stutter or jitter when cutting arcs near top of sheet-- **URL:** \ **Category:** MakerMade\ **Tags:** accuracy\ **Created:** [August 21, 2021, 5:11pm UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035 "2021-08-21T17:11:20Z")\ **Posts on this page:** 13\ **Page:** 4
**Author:** ![md8n](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/md8n/32/28197_2.png) [@md8n](https://forums.maslowcnc.com/u/md8n)\ **Post date:** [November 12, 2021, 9:32am UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/62 "2021-11-12T09:32:44Z")
> [@dlang](#): > > I think the gcode cleaner that Lee wrote has an option to trim decimal places. It does trim decimal places, but it ain’t optional, it’s dependent on the NIST spec, and the tolerances you use. > [@dlang](#): > > I thought the gcode cleaner had an option to replace really shallow arcs with stright lines. Yes it does, and again it isn’t optional, it will always do this replacement, subject to the tolerances. ---
**Author:** ![md8n](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/md8n/32/28197_2.png) [@md8n](https://forums.maslowcnc.com/u/md8n)\ **Post date:** [November 12, 2021, 9:37am UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/63 "2021-11-12T09:37:43Z")
> [@ceka](#): > > My other thought, previously mentioned, is that Arduino Due is just too slow, or the baud rate is too slow. I’ve seen other comments online that Arduinos cause motor stutters with servo motors. > Does anyone have any ideas? From my own testing I found that the Arduino could only process about ~10 lines of GCode per second. Which was a big reason why I wrote GCodeCleaner in the first place. So if you’ve got lots of tiny little movements in your GCode then it can effectively choke on trying to feed the lines through. For example, some of the GCode that I had for a project was doing about 0.1mm per line of GCode, so instead of my cutting speed being ~12.5mm per second it ended up being just ~1mm per second. ---
**Author:** ![ceka](https://avatars.discourse-cdn.com/v4/letter/c/3bc359/32.png) [@ceka](https://forums.maslowcnc.com/u/ceka)\ **Post date:** [November 15, 2021, 4:58am UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/64 "2021-11-15T04:58:23Z")
md8n So I did get my machine working. The one caveat is that I had to slow it way, way down in order to eliminate the jitters. No doubt due to the slow, slow Arduino Due (MakerMade) Also stopped using Fusion and went with Easel instead. Simple and straightforward After cutting two sheets of 3/8" plywood, I had to stop because my neighbors were complaining about the noise–giving them migraines I was able to cut what I needed, for now, but since the rig is in my driveway I’m unable to use it because of the noise and because its actually raining in Norcal I cant complain about the rain–hoping for more to end the drought. And the wildfires are out for this year I need to spend some time sound insulating the Dewalt router if hope to be able to use it again–trying to be a good neighbor. I was really surprised that a 1/8" upcut bit on 3/8" plywood would be so loud. I’m also using a 2HP shop vac The 3-4 hour cut time is a big part of the problem–due to the slow speed Thanks Chuck ---
**Author:** ![md8n](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/md8n/32/28197_2.png) [@md8n](https://forums.maslowcnc.com/u/md8n)\ **Post date:** [November 15, 2021, 7:57am UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/65 "2021-11-15T07:57:17Z")
> [@ceka](#): > > After cutting two sheets of 3/8" plywood, I had to stop because my neighbors were complaining about the noise–giving them migraines One advantage of living in Timor-Leste - no-one cares abut noise pollution. Which explains why you need to wear industrial hearing protection here for “Tinan Foun” (new years) which goes on for about 2 days non-stop. So if you get the latest copy of GCodeClean and run your new GCode outputs through it, it will hopefully do a much better job of reducing many teeny tiny colinear cuts into one big single cut, and therefore give you better GCode line-by-line performance, because there’s less of them. For arc deduplication I still have a way to go (much mathematics involved), but it will still do some deduplication. With regard to slow feed rates (as a consequence of slow GCode processing) you’ll also want to consider your spindle speeds (slowing down the router), and reducing them to match. Along with that switching to a single flute bit can help. If you’re getting charring on your cuts because the effective feed rate is juts too slow you should consider both of these options. > [@ceka](#): > > I’m also using a 2HP shop vac The biggest source of noise for me is my shop vac and not the router. Although the router is loud of course. My cat loves the noise, but then again his favorite song is [https://www.youtube.com/watch?v=7dR5NWchEpM](https://www.youtube.com/watch?v=7dR5NWchEpM) (and yes he does have very definite musical tastes) He does like things very very loud ---
**Author:** ![dlang](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/dlang/32/859_2.png) [@dlang](https://forums.maslowcnc.com/u/dlang)\ **Post date:** [November 16, 2021, 2:33am UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/66 "2021-11-16T02:33:18Z")
try a straight bit, different biys can greatly change the noise level David Lang ---
**Author:** ![Orob](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/orob/32/16344_2.png) [@Orob](https://forums.maslowcnc.com/u/Orob)\ **Post date:** [November 17, 2021, 2:00pm UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/67 "2021-11-17T14:00:33Z")
The harbor freight dust collector is very quiet and works very well for the cost. It is just huge. ---
**Author:** ![ceka](https://avatars.discourse-cdn.com/v4/letter/c/3bc359/32.png) [@ceka](https://forums.maslowcnc.com/u/ceka)\ **Post date:** [November 17, 2021, 5:58pm UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/68 "2021-11-17T17:58:42Z")
Orob That’s what I’m using. The noise is acceptable The noise from the router is not–I need to wear ear protection I’m not sure why it is so loud, and penetrating. My neighbors weren’t happy M8dn suggested a straight flute bit. I am using a 1/8" upcut I plan on adding an 8" diameter clear, polycab shroud around the router to see if that helps reduce the noise Also, the 3-4 hour non-stop cutting is a problem. I know that I can pause it, but I don’t think that will help much… Thanks Chuck ---
**Author:** ![Orob](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/orob/32/16344_2.png) [@Orob](https://forums.maslowcnc.com/u/Orob)\ **Post date:** [November 17, 2021, 11:53pm UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/69 "2021-11-17T23:53:11Z")
Are there loose wood parts that are clattering at high frequency or metal pieces that are resonating. Maybe glue or padding would help quiet it if applied to the right location. ---
**Author:** ![dlang](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/dlang/32/859_2.png) [@dlang](https://forums.maslowcnc.com/u/dlang)\ **Post date:** [November 18, 2021, 12:34am UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/70 "2021-11-18T00:34:48Z")
There is at least one person who has built their machine into an encosed cabinate (built 9" wide skirts and then out from that far enough to give clearance for the router and a clear panel across the front. David Lang ---
**Author:** ![ceka](https://avatars.discourse-cdn.com/v4/letter/c/3bc359/32.png) [@ceka](https://forums.maslowcnc.com/u/ceka)\ **Post date:** [November 18, 2021, 7:35am UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/71 "2021-11-18T07:35:24Z")
Orob I dont think it was cause by vibration. I had the plywood, 3/8", screwed to the 3/4" wasteboard at 12-24" spacing simply because it has a real tendency to warp ---
**Author:** ![ceka](https://avatars.discourse-cdn.com/v4/letter/c/3bc359/32.png) [@ceka](https://forums.maslowcnc.com/u/ceka)\ **Post date:** [November 18, 2021, 4:42pm UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/72 "2021-11-18T16:42:25Z")
David That’s a really great idea. My worksurface is 9.5’x5.5 and I use the entire area BTW, it still does not cut well in the far lower right, even with a 12’ beam. I have to push down on the sled with my hand to make sure it does not wander Also, I’ve found that I need to reduce my image to stay 1" inside the 4’x8’, otherwise it hits the soft limits I suppose I can adjust those limits so that does not happen, but I needed to finish cutting my templates I haven’t cut in the lower left yet. Probably the same problem Here’s something I would like to see: To be able to go back and re-cut a certain area of the sketch, And, to be able to re-start where it stopped if there is a problem I realize this is a software issue. Neither Fusion or Easel seem to allow for this If I could capture part of the gcode and resend it, that might be a workaround Thanks Chuck ---
**Author:** ![Orob](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/orob/32/16344_2.png) [@Orob](https://forums.maslowcnc.com/u/Orob)\ **Post date:** [November 18, 2021, 5:22pm UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/73 "2021-11-18T17:22:30Z")
If you are careful, you can remove already cut portions of gcode after the starting header and then save the file. As long as you haven’t skipped a chain link or altered your machine somehow. If it knows its position and doesn’t need to be recalibrated, you can recut pieces, but it is time consuming to set it up. In a pinch, it can save the piece of wood. As long as you have the offset work position correct as it was when you started cutting it will work. ---
**Author:** ![dlang](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/dlang/32/859_2.png) [@dlang](https://forums.maslowcnc.com/u/dlang)\ **Post date:** [November 18, 2021, 9:34pm UTC](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035/74 "2021-11-18T21:34:34Z")
> David > > That’s a really great idea. My worksurface is 9.5’x5.5 and I use the entire area > > BTW, it still does not cut well in the far lower right, even with a 12’ beam. with a 10’ beam and a 8’ workpiece, you have 1’ of beam out each side and 4’ down on the workpiece (plus beam offset) with a 12’ beam and a 9.5’ workpiece, you have 1’3" out each side, but are now going 5.5’ down (plus beam offset), so I wouldn’t be surprised if your angles were even worse than stock. put your numbers into the online calculator to compare things. > **[Maslow Chain Geometry diff](https://docs.google.com/spreadsheets/d/1mv-sUyig7rTph58ell1ETJP32yo1pq4JgaVvp45PKqU/edit)** > > Sheet1 > > Change the values in the green fields to reflect the two machines you are wanting to compare. The numbers in the blue areas are the results, the Yellow areas show the differences between the... the key thing to look at is the minimum force for the bottom corners > Here’s something I would like to see: > > To be able to go back and re-cut a certain area of the sketch, > > And, to be able to re-start where it stopped if there is a problem the original groundcontrol software has the ability for you to move through the gcode to the next Z axis move, this is to facilitate the sort of thing you are looking for The problem with editing gcode is that there are some settings that affect code after that (always the first few lines, before you see the first g0/1/2/3 commands, sometimes more, including the first command that includes feedrate ‘F’) if you skip those lines, bad things happen. once you understand the gcode your CAM software is producing, you can edit it, or skip around it to recut or continue a stopped cut, but generalized gcode has lots of traps for people doing this (the good news is that most CAM software doesn’t use a lot of the features that cause the worst problems) David Lang [Previous page](https://forums.maslowcnc.com/t/motor-stutter-or-jitter-when-cutting-arcs-near-top-of-sheet/17035.md?page=3)