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Home Model Engine Machinist > CNC and 3-D Printers > Software and Programming > Electronic Dividing Head using the Arduino

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Old 07-28-2017, 04:28 AM   #251
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Your english looks fine from here I would like to know more about your indexers with more (bad english) and pictures...
Thank You
archie
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Originally Posted by almarghi View Post
I have build two of them, using arduino nano with some small changes (regarding the outputs) and I didn't have any problems with the algorithm, but with the key voltage levels on the analog input. Both worked perfectly from the first time, without any issues.
Since I don't trust any contraption without feedback, I oversized all power components - motors and power supplies - and it worked. For supplying the arduino board, I have build a swithing 9V dc-dc converter and I have used its onboard 5V linear supply.
in the attached picture you can see a bearing cage with 64 holes. No position error detected.
Please excuse my bad english,
Alex


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Old 07-28-2017, 02:55 PM   #252
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Thanks for posting, Shopshoe. It's great to see folks getting some good out of this thread.

Chuck


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Old 08-01-2017, 10:14 AM   #253
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Hi jeep534,
there is not much to tell. You can see both of them in the photos. One of them is vertical, the other horizontal.
The vertical one is a gear belt type, 1:5, with an normal XL037 belt. There is only one bearing inside, double row angular contact, SKF3306 ATN9, to be as flat as possible. My milling machine is an Optimum BF20L, small but not very rigid , so I have to be as low as possible with the spindle.
The second dividing head, is a 1:80 HarmonicDrive personal construction. Unfortunatelly I lost all photos I made during construction. I have only the project drawings left and I can take some pictures of the completed head.
Since I work mostly with aluminium, large diameters with thin walls, the Harmonic Drive head has now a 6jaw , 100mm chuck to prevent deformation.
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Old 08-02-2017, 08:34 AM   #254
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Hi all,

Sorry for the delay, but I've been a bit busy lately. I finally got the dividing head somewhat finished. I still need to make a box for the PSU and the stepper driver, but the actual dividing unit is now complete. I haven't tried it out yet, but I don't see why it wouldn't work just fine.

As I mentioned before, I did contemplate making some sort of a spindle brake, but it seems pretty pointless, as the steel reinforced polyurethane belt is much more rigid than the original rubber belt I was planning to use. I'll have to take some test cuts and see how rigid this thing actually is.

The spindle housing is a solid chunk of steel with a hole bored through and a recess milled at both ends for the 6007 ball bearings. Not ideal bearings for this purpose, but they do seem good enough. If I choose to use angular contact bearings, I still have plenty of material so I can bore the bearing seats a bit larger. The motor bracket is aluminium.

The spindle is an ordinary straight shank ER32 collet holder and the stepper motor is a 3Nm Nema 23 unit running at 48V.
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Old 08-03-2017, 05:24 PM   #255
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Pink with white polka-dots? Not exactly your average machine tool color scheme. Did you lose a bet and have to paint it that color?

Don
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Old 08-04-2017, 06:04 AM   #256
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No lost bets here. I firmly believe it should be mandatory to paint all metalworking machinery pink. Polka dots are optional due to their mildly psychedelic effects which may result in either futuristic machine designs or severed limbs.

Besides my shop is already full of boring green and grey and black machines.
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Old 08-11-2017, 01:00 AM   #257
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Let's hope the severed limbs are just a hallucination
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Old 08-12-2017, 06:07 AM   #258
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just finished a m0.8, z153 gear. No problems on dividing
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Old 08-12-2017, 03:06 PM   #259
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Nice. Is that a focusing ring? I 3d printed some for my son. I've since acquired a cutter but haven't tried it yet.
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Old 08-12-2017, 06:27 PM   #260
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yep! You good guess! 115mm inside, 15mm wide


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