How much Torque is required when cutting?
I hope I am asking this in the right section but here we go.
I am looking at the Keling KL34H280-45-8A Stepper Motor, http://www.kelinginc.net/KL34H280-45-8A.pdf http://www.kelinginc.net/KL34H280-45-8AT.pdf I am still in the planning stages but I would like to do a 3.1 to 1 belt drive with a 20 tooth pinion. If I have done my math right I should end up with a almost 1:1 with the steppers rpm and 3 times the torque at rated speed. Now for a few numbers, I would have Stepper RPM-------Stepper Torque-- Pinion Torque--Table Speed(est) 150rpm------------594oz------------1841oz--------150ipm 300rpm------------580oz------------1798oz--------300ipm 600rpm------------509oz------------1577oz--------600ipm 900rpm------------410oz------------1271oz--------900ipm 1200rpm-----------311oz------------964oz---------1200ipm 1500rpm-----------254oz------------787oz---------1500ipm 1800rpm-----------198oz------------613oz---------1800ipm This was all caculated from the torque/speed chart. My question is will the torque and speed meet the Mechmates need with the above setup? I have never cut at a significant speed and dont have a clue what is required for cutting. Would anyone object to this stepper motor and setup. In my mind it sounds good but then again what do I know. |
Consider that a 20 tooth pinion which has a 20 diametral pitch has exactly a half inch radius. Therefore, a 613oz.in torque on a 20 tooth pinion is going to give you 1226 ounces of linear "pushing" force at the cutter, which is 76 pounds, which is plenty for a typical bit in a hand pushed router.
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I have the 640 oz Keling steppers, with beltdrives. no problems so far and I am very happy with them.
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Leo, are you running them 3 to 1 or are you doing a different setup. Thanks guys for the responses. I feel very comfortable with the mechanics but unsure of the electronics that need to be put in. Thanks again. Russell
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Yes, I am using the 3 to 1
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Why beltdrives?
So, why do you use beltdrives in your machines?
I now build my 1mx2m cnc and I have 640oz-inch steppers with G203 and ballscrew 2510 and I plan to put them directly to ballscrews....If I put belt drive I will have decreased speed right?I do not want to decrease the speed... Will I have any problem with this? Kostis. |
Kostas, this forum generally only handles the specific MechMate machine design.
The answer to your question is that the MechMate uses rack and pinion, and thus gearing/belting down the motor makes sense. With a ballscrew, it wouldn't, since the ballscrew naturally does that. Whether you will have problems is a question for another forum, I think. Good luck with your build. |
Ok sorry then,
thanks for clearing this out Bradm... Good luck to you too...:) |
Quote:
( Im a Mach3 and G203 person.) The reason why is simple I decided to go "THAT path - G540 and Linux" on one of the slanted machines I´m building:D. I know that its a learning curve on everything new thing you have to learn, so " Lets Start NOW!! " :) If you wounder in what build it will apear etc..Its this machine you can see grow in this moment taking its shape in my building three below. http://mechmate.com/forums/showthrea...7&postcount=25 Feel free to answer either in the three above or here ! So if you have same advice or what to avoid etc or likewise let me know. /oopz |
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