While running? If the power supply is underrated it will deliver less when the current draw increases. Wire gauge can also cause voltage drop, what are you using to connect to the steppers?
I did not check it while running, used a volt meter while idle. The Power Supply is 24V 2.5amps which I bought the power supply that came with the V1 hardware kit @vicious1, so I canāt imagine itās not the correct power supply. Now that you say this, Iām seeing online the Nema 17 motors need 1.2 amps each peak" so thatās 5+amps possible peak for the 5 motors. That means the machine should really be using one of these. MEAN WELL LRS-350-24 350.4W 24V 14.6 Amp Single Output Switchable Power
What Ryan sells is ideal for a LR machine.
No, not true. The power supply is rated 24V 2.5A, so 60W.
The motor current is rated at their spec voltage of 3.06 V, which is a different delivered power to the motor.
You canāt just sum the current the way you did.
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Well Bummer @Dreyfus I was really excited for a moment that you were onto something. Makes sense that this is the correct power supply from V1, but Iām really running out of solutions here.
The machine did well today cutting 1/4" with no issues, I cut 6 full sheets at 1000mm/min. Maybe the 1/2" OSB is just a lot tougher than I thought and I need to go even slower like 600mm/min with like #4-3.5mm passes. Just going to take actually forever.
I donāt know that i have cut OSB but all that glue can surely make it a difficult material. Maybe look in the gallery to see some other OSB projects and check their speeds. Indo know some cheap ply has pockets of glue that really slow things down.
Maybe some test cuts in a uniform material like MDF, or some cheap pine (with no knots).
Ok, I think Iām going to try really slowing it down. to see how that goes.
None of you will be surprised that switching to the JackPot board did not fix my issues. But WOW! This new board is Fantastic. The Fluid NC side of things is sooo much better than the SKR. The Limit Switches are Super Convenient, I setup a macro to HOME the system then move to the start position of my 4x8ft. When It randomly fails, I can just remove completed sections of the file (IT Homes and moves to start) while Iām doing that. Then I just upload a new file and GO! SO much less down time, while I spin the knob to get it back to start from the other end of the table after it skipped and got off.
We have been JigSawing a lot of the larger stuff, but Iāve been cutting 1/4" plywood faces with the CNC. The other day it cut 3 full sheets with NO issues. 1000mm/min at 1/4" cuts. WOW! Since then I canāt get it to even cut those reliably at 500mm/min.
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Iām sorry youāre having so much trouble. I donāt know if I can give you any other ideas, but my machine was recently doing something similar, so I thought Iād share. The major differences are that I was cutting aluminum, 1/8" end mill, and my machine is 30" x 60" working area.
I would see the end mill change X - position and fail to follow the preceding cuts. I also saw it do the thing where it just started randomly cutting off in an uncontrolled direction, ruining the material.
It took me 2 days to really analyze what was going wrong. (Luckily I donāt use mine to earn money yet.) It came down to 3 things:
- Chip Clearing: I needed to give the end mill more room to clear chips, so I switched to trochoidal milling (not applicable to your use.) This was caused by insufficient clearing of the chips, which would weld back on to the workpiece. Not sure this one would apply, but evaluating chip removal might be helpful. (I donāt evacuate metal into my dust collector so I needed to blast it away with compressed air.)
- Heat: The inadequate chip clearing, material, and spindle speed were all generating heat. I did add isopropyl alcohol as a coolant (also not appropriate for your use) to give me some margin on my settings. I ended up cutting at about 16000 rpm. I believe this would be just under the ā3ā setting.
- Dull End Mill: I realized that after long cuts the loss of steps was hard to notice, but that the end mill was simply getting dull. As a note, I generally use end mills from V1E (and find them to be good) and from Amazon (crapshoot). But these endmills are on the inexpensive side so I do find that one will occasionally dull faster than normal. (Subjectively, I also think the 1/4" mills are a bit more consistent than some of the 1/8" mills Iāve used.)
In reading your chain and thinking through my own troubleshooting, I did come up with a few ideas. Not sure theyāll help, but thought Iād share. (Also, please know that I havenāt worked with OSB much.)
- I wonder if better chip clearance could help reduce heat. (I think it was mentioned in the chain above.)
- I wonder if turning the spindle speed down could help reduce heat.
- I wonder if the glues/resins in the OSB are dulling the end mill faster than expected. Your machine is also large compared to mine, so your bit could go for a much longer time on a single process (thereby building up more heat and dulling faster.)
- In doing a little reading (very little) on milling OSB, the grain pattern on the chips being so random seems to be a challenge. I wonder if there is a tendency for the forces on the end mill to vary pretty widely. (Maybe every cut you do should be considered a crosscut?)
The process youāre cutting (the large windows) also look pretty demanding. Between each lite, the end mill can be raised from the material and spin in air as it moves to the next lite. But the window outline is a very long cut without any time to dissipate any heat. This is where professionals should chime in. I guess I wonder if you should change endmills between the lites and the outer parting cut. Or do the outer parting cut first, since the mill would have the most ability to sink heat at that point.
I guess Iām focusing on the process since you said your machine performed really well for those first two cuts. Good luck, and I know the community here will continue to help troubleshoot to the best of their ability.
And please feel free to ignore this if it isnāt useful or helpful.
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Weāll have to keep digging for the root causes.
What a month it has been! I finished the new Stage Design Project, it took about 300 hours though. We ended up using the Circular Saw for a bit of the cutting of the rectangles from the 1/2" OSB, but used the CNC to cut all the faces out of 1/4" plywood. There is a Diffuser layer between the 1/2" LED layer and the painted black Face, with a white back on each to reflect the light. (WhiteBack->1/2" OSB with LEDS & Wiring-> DiffuserMaterial-> 1/4" Face painted black.) In the final days of cutting I took the Router off the CNC to do some manual routing and realized the single flute end mill was horrible on any speed, Itās hard to run on speed of 3, Which is what was recommended. No wonder the machine was struggling. I switched back to the duel flute end mill and turned the speed all the way up and it cuts like butter. havenāt put it back on the CNC yet, to try and cut something, but there is clearly more to this then I previously realized. I learned I should manually cut a sample of the cut material to check for the best settings, then cut with the machine.
Thank You all for your help on this! Now I need to get back to the dreaming stage to see when we should cut next.
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Thank You
@spsully2582
@Tokoloshe
@dgkeith237
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This sounds like a dull bitā¦
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