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#1
 
10-22-2010, 07:51 AM
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I built a basic 3 axis cnc and I am driving it with 1/2" acme 10tpi rod. which stepper motor out of the following three will give me better torque. 425oz-in 387oz-in or 382oz-in all nema 23 motors from keling. Thanks Rob  |
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#2
10-23-2010, 04:22 PM
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| Well I ordered my steppers today and I chose the 382 oz-in with a 24volt 16 amp power supply. With my 1/2 inch 10 tpi ACME lead screws I should have plenty of lift for the Z axis and plenty of torque for X and Y movement as well. |
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#3
10-23-2010, 04:25 PM
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| What drives are you using? When using 1/2-10 acme, you won't get a lot of speed, because they need to spin too fast. At slower speeds, though, you'll have plenty of torque.
__________________ Gerry Mach3 2010 Screenset http://home.comcast.net/~cncwoodworker/2010.html (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |
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#4
10-23-2010, 05:15 PM
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| Thanks for the vote of torque confidence Gerry. My first cnc is not going to be a speed demon as I need to learn much about cnc before I get crazy with it. I don't care if it takes a bit longer to cnc something at this point I have much to learn. A Photo of my machine below. I call her Ugly Betty 1. She's ugly but she's mine. Last edited by Rob37; 10-23-2010 at 06:15 PM. |
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#5
10-24-2010, 08:37 AM
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| If I might make one tiny suggestion to you... You might want to stiffen up the pieces that support your bridge. When the mass of your Z axis assembly starts or stops rapidly, you may have some flex there. A piece of angle with some more MDF attached would probably do the trick. Steve |
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#6
10-24-2010, 09:23 AM
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| Steve Thanks for the heads-up on the gantry. Yes I agree that it will probably flex a bit under load. I chamfered and bolted two full 3/4" pieces together under the 1" aluminum angle that you see in the picture. I am hoping that the flex will be minimal as I intend to use this machine to cut better parts for a better designed machine. Rob37 |
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#7
10-25-2010, 07:00 AM
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| Rob, The area of concern to me is the vertical end pieces. I marked up your picture... The flex points are along the red lines, the proposed stiffeners would be in line with the blue lines extending out from the surface making the end plates into a sort of a C channel. Steve |
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