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Re: Step #1 Encoder #RELS

 

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I totally agree with Rex.? You do not want any oscillation between spindle and encoder.?

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When I started my ELS project the one thing I could not do was find an encoder with a bore capable of fitting around the spindle and the collet draw bar.? I could have one made but the cost would be $70 and I had to buy 100. ?Also at the time, (2007) inexpensive bearing mounted quadrature encoders were way too expensive compared to our target price of $150 for the ELS kit. ??Even now high quality encoders are into the hundreds of dollars.

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Anyway, this was my initial approach that slipped over the end of the spindle.

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And fit through the hole in the cover. ?Just had to screw on the disk afterwards and then use the cover mounting screws to hold the sensors.

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The CAD drawing shows what the disk would look like.? But in the end I just couldn't mount it securely enough and I didn't want to try and make a fibreglass cover to go over everything in place of the cast cover.

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John

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From: [email protected] [mailto:[email protected]] On Behalf Of Ralph Hulslander
Sent: December-10-19 2:04 PM
To: [email protected]
Subject: Re: [digitalhobbyist] Step #1 Encoder

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Thanks John, I still have your ELS in mind.

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Here is a very very rough starting idea for mounting the encoder and the gear:

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Ralph

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On Tue, Dec 10, 2019 at 2:22 PM John Dammeyer <johnd@...> wrote:

Hi Ralph,

From what I can see from reading the Arduino code it looks like it needs at least the same number of pulses from the spindle as it needs to send to the stepper motor.? The code I was looking at (pretty old now perhaps) uses a 200 step per rev motor, 4x micro-stepping for 800 steps per rev so the 1800 lines per rev are important.

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I think that's why you can turn the spindle in either direction and the stepper motor tracks.? It's a totally different approach from MACH3 and my ELS.? Even what the code does and how it's written is totally different from my ELS.

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John Dammeyer

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From: [email protected] [mailto:[email protected]] On Behalf Of Ralph Hulslander
Sent: December-10-19 11:10 AM
To: [email protected]
Subject: Re: [digitalhobbyist] Step #1 Encoder

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Thanks for the replies!!

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Rex, yes I wondered about slop in the gear.

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I cannot see where any loading to the encoder would come from, of course I have not shown how I was going to mount the encoder and gear, I need to get busy drawing the mounting up.

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I will use the need for the drawings as the final reason to learn Fusion 360.

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Would the #RELS run with a single pulse for spindle speed? Even 8 pulses would be relatively easy.

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I could just mount 8 magnets on the spindle gear, they would not even have to be accurately spaced if the #RELS just needed to see 8 pulses.

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Ralph

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On Tue, Dec 10, 2019 at 12:26 PM Ant No <cmpaqp1100@...> wrote:

A mill can be viewed as a subtractive 3D printer. The tasks and automation are very similar.?


--
Clausing 8520, Craftsman 12x36 Lathe, 4x12 mini lathe, 14" Delta drill press, 40 watt laser, Consew brushless DC motors and a non working 3D printer


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Clausing 8520, Craftsman 12x36 Lathe, 4x12 mini lathe, 14" Delta drill press, 40 watt laser, Consew brushless DC motors and a non working 3D printer

SpindleEncoderAssembly1.pdf
SpindleEncoderAssembly1.pdf

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