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Old 03-24-2019, 02:33 PM
Moccasin Moccasin is offline
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Default Can't make round holes

non circles.jpg
Soon after setting up my Stinger 1 table top machine I noticed the circles or holes were not round. I spoke with tech support and they said to check the Allen screws on the gears. I did find that one was not tight on the small gear so tighten it. The issue mostly went away so Iíve been living with it. Within the last few days Iíve notices the circles were again out of round and also hear a popping or clunking sound coming from the same area where the gears are located. Wiggling stuff around, I found that the Allen screws holding the bottom aluminum plate in place were slightly loose. Tightening them stopped the popping sound but did nothing for the circles. It appears to me that the Y axes is the issue when studying at the attached drawing. Any advice is welcome.
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Old 03-24-2019, 02:53 PM
The real JP The real JP is offline
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Join Date: Mar 2017
Location: Oklahoma
Posts: 515

maybe look through some of this.

Are there belts on the stinger1? If so, check tension.

Industrial electrician by day, Cabinet and furniture maker by evening and weekend. Cnc newb.

June 2017 Stinger 3 SR48
3kw spindle, FTC, Laser, Recoil, Hurricane
V Carve, Mozaik

Last edited by The real JP; 03-24-2019 at 03:33 PM.
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Old 03-24-2019, 04:18 PM
Jim Becker Jim Becker is offline
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Join Date: Jan 2018
Location: SE PA
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Check the tension on the X-Axis belt up behind the spindle/router mount. Mine was slightly loose early on and that caused the out-of-round issue. Tensioning it properly fixed the problem.
Jim Becker

SR-44 (2018), 1.7kw spindle, Performance Premium, USB, Keypad, T-Slot table (y-axis configuration), WinCNC, VCarve Pro upgraded to Aspire

Non CNC stuff...

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Retired from full time work in the telecom industry 9/2017
Commission work for equestrian tack storage and other custom furniture and cabinetry
Located Bucks County PA
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Old 03-26-2019, 08:09 AM
janeian janeian is offline
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Join Date: Dec 2012
Location: White Head Island, NB, Canada
Posts: 219

I had a similar problem cutting 10" circular clock faces several years ago. As I recall, Gary Campbell suggested an alignment of the gantry which I did. It was a PITA to do, involving loosening all the gantry screws except one, slightly tapping the gantry frame on one side with a rubber mallet then tightening all screws then test again. The PITA was having to repeat this a good number of times, running the test, undoing/redoing, run get the idea. Unfortunately I won't be back to my shop for 3-4 weeks which is where the written instructions for this fix are. So, assuming that this may work for you, perhaps Gary or someone else who's done it, can describe the procedure. As with every other piece of equipment in my shop, my Stinger 1 required tweaking for it to run as well as it possibly can. By the way, this procedure worked extremely well and since then, my settings haven't budged. My clock circles are still perfect to this day. Hope this helps.
Ian Bernard
Stinger 1,
1.7kw spindle
V-Carve Pro
Home made vacuum
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Old 04-01-2019, 11:24 AM
Steve Burke Steve Burke is offline
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Join Date: Jun 2017
Location: Bonaire, Georgia
Posts: 44

George, did you ever find the problem? If so could you share the solution?
Stinger 1 SR-23
Windows 10
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Old 06-09-2019, 06:16 PM
Moccasin Moccasin is offline
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Join Date: Jul 2017
Posts: 23

Originally Posted by Steve Burke View Post
George, did you ever find the problem? If so could you share the solution?
Weíve been out of state for a few weeks and just returned. I removed the bottom support plate where the Y drive motor bearing is located. All allen head screws were tight. I check all the allen set screws on both gears and all are tight, in fact, 2 are so tight I didnít try to loosen them for fear of stripping the threads. I also checked the tension on the X-Axis belt as Jim suggested and it is tight as are all the screws their. Reassembling the bottom plate on the Y axes seemed to help a little but itís still not right. Iím at a loss at this point so Iíll contact tech support. Thanks for all the suggestions.
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Old 06-16-2019, 08:23 AM
Moccasin Moccasin is offline
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Join Date: Jul 2017
Posts: 23
Default Still no round holes - update

Iíve been in touch with tech support concerning this on-going issue. I first want to say that I do appreciate the swift response and how attentive they are to my problem. Iíve spent a few days on the issue and believe weíve eliminated some of the possibilities, IMHO. Iíve been over every cap screw and bolt I can see; tried to shake every part and checked the engagement of the X&Y rack and pinion gear sets every 4Ē. Nothing I can find is loose or out of adjustment. Here is why I donít think the problem is with the rack & pinions. As can be seen in the drawing, only an illustration as the offset cannot be seen in a carving, only with a drawing, circles have a flat side on the top and the bottom of the cut. This is the case no matter where on the table the cut is made. It is also the case no matter the size of the circle up the maximum Iíve cut of 4Ē. Saturday, I placed a fine point pen next to the spindle and drew several circles. The results are the same but as you can see in the drawing, the ends did not meet. Would it not change depending on where on the table it is drawn if the issue was with one of the rack and pinions? Even if a tooth on a pinion gear was bad, would not that cause the circles to be slightly different in different locations or on different sizes of circles? Both belts are tight and the slide plates that move the pinion gear and drive motors into the racks are as they should be, as best I can tell. No slop and full engagement with the racks. I am less sure on this point but it appears to me the problem happens when the Y axes changes direction? Just a thought, but, could this be a firmware issue? I sent the code for one of the circles to tech support and I can generate a circle in both Vcarve and Aspire with the same outcome. Iím at a loss here and welcome ant more suggestions.
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Old 06-16-2019, 09:40 AM
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Gary Campbell Gary Campbell is online now
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Join Date: Dec 2012
Location: Marquette, MI USA
Posts: 2,901

Thank you for the very clear drawing. Your issue is most assuredly play or backlash in the X axis. Thinking that it is anything else will prevent you from finding the cure.

To define clamp a dial indicator to the gantry beam with the indicator point against the X axis plate. With motors powered up, push pull on the X plate using firm pressure. Dial will show the backlash. As you look into the mechanics of the X transmission with a friend moving it, you should be able to determine where the play is located.

Those items would be: (no order of importance)
Loose set screws on the motor (small) or trans (large) pulley
Loose Belt
Worn spur gear
Loose spur gear setscrews
Sticking Slide plate. This is the plate that supports the large pulley and spur gear shaft. It is spring loaded and should move with hand pressure away from the rack, then spring back to it.
Missing or out of adjustment slide plate tension spring
Loose slide plate bolts
Loose transmission bolts
Loose rack bolts
Bad transmission bearings
Gary Campbell
CNC Technology and Training
The Ultimate Woodworking Machine

"There are 10 kinds of people in the world. Those that understand binary logic, and those who don't"
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