Page 2 of 2 FirstFirst 12
Results 16 to 20 of 20
  1. #16
    Join Date
    Jul 2006
    Location
    home
    Posts
    621

    Default

    I get a discount as a member of the local makerspace (HobartHackerspace) which I can't get via mail order.
    Besides, being in the store gives me a chance to buy shiny things I don't really need.

  2. #17
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,440

    Default

    Hi Geoff,

    Quote Originally Posted by snowyskiesau View Post
    While getting most of the electronic components I need for this from eBay is not a problem, the time take for free shipping is annoying - not enough to actually want to pay for shipping but still it slows things down.
    PCB's are on their way, should be here this week. I still need to order the encoder,
    It may be worth investigating a computer mouse for the encoder wheel or a scrap inkjet printer. There is usually a very salvageable encoder wheel and photo optic sensor on them.

    Encoder_Disk.jpgIgnore the centre punch propping up the back edge


    At least there has been some progress on the mechanical side. Thanks to PDW, the pulleys have been bored and fit like a treat.
    The last image shows the pulleys fitted and the stepper motor where I hope it will be. As the stepper is a close fit where it's shown, there's no room for adjustment so I hope I can get a belt with the required number of teeth. I've ordered a NEMA 23 motor as a replacement which is 3mm smaller than the NEMA 24 shown so it might be adjustable enough.

    I've found that the shaft where the larger pulley is attached is not actually the lead-screw shaft. There's a 1:1 gear drive from this shaft to the lead-screw, presumably to provide an offset so the gear will fit into the side housing. The gears involved are not tight and have a large amount of backlash. Hopefully the software can compensate for this

    I've also been looking at this Myford project as a model for my cross slide modification.
    Best Regards:
    Baron J.

  3. #18
    Join Date
    Jul 2006
    Location
    home
    Posts
    621

    Default

    A mouse encoder wont do the job unfortunately as the rotary encoder has to provide a quadrature signal as that's what the controller expects. It also has to provide an index pulse, once per revolution, so the controller knows the position of the spindle.
    A quadrature signal will also indicate direction of rotation.

    This one looks like a good fit. 1000ppr (pulses per revolution) which give a resolution of 4000 pulses per revolution using quadrature. Index pulse too. Only $30 -$40 on ebay.
    Attached Images Attached Images

  4. #19
    Join Date
    Jul 2005
    Location
    Melbourne
    Posts
    15

    Default Sieg C6 ELS

    Quote Originally Posted by snowyskiesau View Post
    A mouse encoder wont do the job unfortunately as the rotary encoder has to provide a quadrature signal as that's what the controller expects. It also has to provide an index pulse, once per revolution, so the controller knows the position of the spindle.
    A quadrature signal will also indicate direction of rotation.

    This one looks like a good fit. 1000ppr (pulses per revolution) which give a resolution of 4000 pulses per revolution using quadrature. Index pulse too. Only $30 -$40 on ebay.
    Did you ever get this to completion? I have just ordered the 4 axis version from this guy https://kachurovskiy.com/?syclid=ffd...a-6a67c0b3e199 with a view to motorising both lead screw and crossfeed. It is early days but have a servo version of the nema 23 to test whether it is powerful enough for the lead screw (if not it will drive the crossfeed) and 600lpi encoder for the spindle.

    Regards

    Mike

  5. #20
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,440

    Default

    Quote Originally Posted by snowyskiesau View Post
    A mouse encoder wont do the job unfortunately as the rotary encoder has to provide a quadrature signal as that's what the controller expects. It also has to provide an index pulse, once per revolution, so the controller knows the position of the spindle.
    A quadrature signal will also indicate direction of rotation.

    This one looks like a good fit. 1000ppr (pulses per revolution) which give a resolution of 4000 pulses per revolution using quadrature. Index pulse too. Only $30 -$40 on ebay.
    Hi Mike,

    Actually a mouse does use a quadrature signal, but its very coarse compared to a proper encoder.
    Best Regards:
    Baron J.

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Sieg C3 mini lathe?
    By oz94 in forum METALWORK GENERAL
    Replies: 6
    Last Post: 17th Dec 2014, 10:54 PM
  2. My Sieg C4 lathe after some clues
    By colbra in forum METALWORK GENERAL
    Replies: 8
    Last Post: 16th Apr 2012, 11:46 PM
  3. Sieg C3 lathe micro mod
    By arose62 in forum METALWORK GENERAL
    Replies: 1
    Last Post: 12th Mar 2012, 05:43 PM
  4. Taking the Sieg C6 lathe apart
    By snowyskiesau in forum METALWORK GENERAL
    Replies: 17
    Last Post: 27th Apr 2011, 09:55 PM
  5. cutting 3.5mm on 960b lathe with imperial leadscrew
    By B the B in forum METALWORK GENERAL
    Replies: 16
    Last Post: 25th Jun 2010, 01:28 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •