Spindle speed optical sensor for Pokeys57cnc - Page 3


Page 3 of 3 FirstFirst 123
Results 41 to 45 of 45

Thread: Spindle speed optical sensor for Pokeys57cnc

  1. #41
    Member
    Join Date
    Oct 2016
    Location
    United States
    Posts
    29
    Downloads
    1
    Uploads
    0

    Default Re: Spindle speed optical sensor for Pokeys57cnc

    On the perfboard-that blue resistor is it a 100k? I can't see it so well

    Last edited by jimairth; 04-12-2017 at 01:24 AM.


  2. #42
    Member
    Join Date
    Jul 2009
    Location
    USA
    Posts
    36
    Downloads
    3
    Uploads
    0

    Default Re: Spindle speed optical sensor for Pokeys57cnc

    Jim,

    Read the bottom of the post as I spoke too soon and am not quite there yet!



  3. #43
    Member
    Join Date
    Oct 2016
    Location
    United States
    Posts
    29
    Downloads
    1
    Uploads
    0

    Default Re: Spindle speed optical sensor for Pokeys57cnc

    On the perfboard-that blue resistor is it a 100k? I can't see it so well



  4. #44
    Member
    Join Date
    Jul 2009
    Location
    USA
    Posts
    36
    Downloads
    3
    Uploads
    0

    Default Re: Spindle speed optical sensor for Pokeys57cnc

    Jim,

    The blue resistor is brown, violet, gray, black and measures 178 ohm.



  5. #45
    Member
    Join Date
    Jun 2010
    Location
    Australia
    Posts
    4252
    Downloads
    4
    Uploads
    0

    Default Re: Spindle speed optical sensor for Pokeys57cnc

    The generic 7414 Schmidt Trigger chip is widely used for interfacing, but most of the variants have quite a low drive capacity, and some do not get close to the rails. The version you need is the 74ACT14: that chip is the bees knees for interfacing as it can drive up to 24 mA each way. It is a plug-in replacement for the the other versions.

    Second thought: put all these 'interface' chips in good sockets. Servicing becomes so easy when you can flip a chip out and plug another in just like that. But CAUTION: when inserting an IC into holes or into a socket, make very sure that ALL the pins are going in. If a pin gets curled up under the chip it is impossible to see it, but the chip won't work as it should. I know ...

    Cheers
    Roger



Page 3 of 3 FirstFirst 123

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
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Spindle speed optical sensor for Pokeys57cnc

Spindle speed optical sensor for Pokeys57cnc