Thread: Wanted Linear Scale/Encoder
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23-01-2013 #1
Hi I am looking for a cheap linear encoder to experiment with, maybe something off an old manual mill? Preferable 5v and something that output a quadrature signal.
Cheers
GavCNC routing and prototyping services www.cncscotland.co.uk
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23-01-2013 #2
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24-01-2013 #3
Hi Jonathan,
At the moment this is just for learning the ropes of a Kflop controler. Closed Loop Stepper
So anything that works would do, the plan was to use a stepper and a linear scale in a small test rig just to play about with the board to see what it can do.
I did think about the callipers, but im not sure they would be the easiest to implement as they do not have the A and B channels that I am used to with encoders?CNC routing and prototyping services www.cncscotland.co.uk
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24-01-2013 #4
It would be easy enough to make something to convert the signal into something compatible, but the callipers response time is far too low to use for motor control, so forget that idea.
Linear encoders are generally very expensive. One cheap way to make one that should be plenty good enough to experiment with is to use a rotary encoder, put a timing pulley on it and have it run on a flat (open ended belt). Wrap the belt round the pulley with two idlers, so when the linear slide is moved it causes the pulley to rotate...I doubt it would be good enough to use in 'real life', due to small errors in the belt pitch and stretching, but worth a try I reckon.
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24-01-2013 #5
Thats a pity. I have a couple of old Heidenhain rod420 or 426 encoders lying around somewhere. You could have one of them.
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24-01-2013 #6
If you just want something to play with try this:
Digital Caliper With Data Output Port
If you do a google search for arduino digital caliper there are loads of people that have hacked calipers. As already said, the response rate is far too slow to use for cnc positioning though.
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24-01-2013 #7Thats a pity. I have a couple of old Heidenhain rod420 or 426 encoders lying around somewhere. You could have one of them.
Linear encoders are generally very expensive. One cheap way to make one that should be plenty good enough to experiment with is to use a rotary encoder, put a timing pulley on it and have it run on a flat (open ended belt). Wrap the belt round the pulley with two idlers, so when the linear slide is moved it causes the pulley to rotate...I doubt it would be good enough to use in 'real life', due to small errors in the belt pitch and stretching, but worth a try I reckon.
I think the Kflop has the possiblity to output positional error, if you could plot the error over time as you cut a certain program into varying materials you could hopefully compare. Could you take this one step further with an encoder on the motor to measure missed steps and linear encoder on the gantry to measure actual postion?CNC routing and prototyping services www.cncscotland.co.uk
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24-01-2013 #8
Well I was just about to order some more cutters which will be about £25 so cover that and its yours if you like. I have one here that hasnt been used.
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24-01-2013 #9
Web Goblin, do you have a model number so I can check the specs.
CheersCNC routing and prototyping services www.cncscotland.co.uk
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24-01-2013 #10
Here you go.
Heidenhain ROD 420 250 01 -03
ID no : 295 281-37
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