Free 186 More Best Homemade Tools eBook:  
Get tool plans

User Tag List

Page 5 of 5 FirstFirst 1 2 3 4 5
Results 41 to 47 of 47

Thread: A request for information on your mill or lathe

  1. #41
    Supporting Member Frank S's Avatar
    Join Date
    Aug 2015
    Location
    Peacock TX
    Posts
    11,635
    Thanks
    2,186
    Thanked 9,134 Times in 4,366 Posts

    Frank S's Tools
    Now that you mention it my 2x48 belt sander gives me a small shock sometimes. I try to avoid touching the frame while grinding but, the shock is sometimes even felt through the work piece when I make and break contact with the rest. I thought it could be a bad ground but after checking I couldn't find any problems. Gloves are such a pain to even remember where a pair are, insulated plier does the trick for small items. There is no way I would have ever correlated a belt sander with the Van de' Graff, but now at least a possible direction for a solution has been made available. Thanks to all for the tip.

    186 More Best Homemade Tools eBook
    Never try to tell me it can't be done
    When I have to paint I use KBS products

  2. #42
    Supporting Member
    Join Date
    Sep 2018
    Location
    Groningen, NL
    Posts
    44
    Thanks
    322
    Thanked 32 Times in 11 Posts

    Carnel's Tools
    Hi Rick,
    "These are the lowest readings I've seen so far. I'm guessing that your machines are new enough to have ball bearings and not babbitted bearings."

    As far as I know it are tapered roller bearings. So a relatively large contact area.

    Harry

    2,000+ Tool Plans

  3. #43
    Supporting Member
    Join Date
    Sep 2018
    Posts
    2,355
    Thanks
    11,180
    Thanked 1,223 Times in 667 Posts

    nova_robotics's Tools
    Quote Originally Posted by Frank S View Post
    Now that you mention it my 2x48 belt sander gives me a small shock sometimes. I try to avoid touching the frame while grinding but, the shock is sometimes even felt through the work piece when I make and break contact with the rest. I thought it could be a bad ground but after checking I couldn't find any problems. Gloves are such a pain to even remember where a pair are, insulated plier does the trick for small items. There is no way I would have ever correlated a belt sander with the Van de' Graff, but now at least a possible direction for a solution has been made available. Thanks to all for the tip.
    No probs. Just make a single metal pulley and put it at the top. That way it grounds out the belt before it has a chance to shoot little zaps into your fingers. Maybe replace the slider/platen thing that holds the sandpaper against your workpiece with a metal one? There are probably a few different ways to prevent charge from building up on the belt.

    But really when you think about it, we're intentionally CAUSING the thing we've spent the whole thread trying to avoid. You are now grounding out your belt through a bearing. I've been using the crap out of mine for years like this and haven't had to replace a bearing yet. I'm sure it's accelerating bearing wear, but those bearings are easily changed and only a few dollars. A mill spindle bearing is a different situation.

  4. The Following User Says Thank You to nova_robotics For This Useful Post:

    Toolmaker51 (Jun 4, 2022)

  5. #44
    Supporting Member Toolmaker51's Avatar
    Join Date
    Feb 2016
    Location
    Midwest USA
    Posts
    5,334
    Thanks
    7,044
    Thanked 3,011 Times in 1,900 Posts

    Toolmaker51's Tools
    This site is always a blast, great minds tackling issues of any kind, with real-world solutions. Points out things we tolerate, without pause to suss out a remedy that might be just a few minutes effort. Amid the negatives the web brings, this makes up for it.

    OK! Now, about this supply chain issue...
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

  6. #45
    Supporting Member Frank S's Avatar
    Join Date
    Aug 2015
    Location
    Peacock TX
    Posts
    11,635
    Thanks
    2,186
    Thanked 9,134 Times in 4,366 Posts

    Frank S's Tools
    Quote Originally Posted by nova_robotics View Post
    No probs. Just make a single metal pulley and put it at the top. That way it grounds out the belt before it has a chance to shoot little zaps into your fingers. Maybe replace the slider/platen thing that holds the sandpaper against your workpiece with a metal one? There are probably a few different ways to prevent charge from building up on the belt.

    But really when you think about it, we're intentionally CAUSING the thing we've spent the whole thread trying to avoid. You are now grounding out your belt through a bearing. I've been using the crap out of mine for years like this and haven't had to replace a bearing yet. I'm sure it's accelerating bearing wear, but those bearings are easily changed and only a few dollars. A mill spindle bearing is a different situation.
    I may have to try other solutions the platen is metal and the top roller is aluminum. Since it mostly happens when the back of my hand or along my fore arm happens to touch the grinder / belt sander housing but only under certain conditions like on the rare higher humidity days something that goes against my belief of it having to do with static electricity alone. I am more inclined to believe what I am experiencing is possibly a dust trail either in the motor itself or in the wiring to the switch. I am thinking the humidity and if it is dust is possibly acting like an impedance capacitor in some way which discharges to my touch. Does any of that make sense?
    Never try to tell me it can't be done
    When I have to paint I use KBS products

  7. The Following 2 Users Say Thank You to Frank S For This Useful Post:

    nova_robotics (Jun 4, 2022), Toolmaker51 (Jun 6, 2022)

  8. #46
    Supporting Member tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    1,607
    Thanks
    722
    Thanked 2,706 Times in 726 Posts

    tonyfoale's Tools
    Quote Originally Posted by rgsparber View Post
    I would like to learn the electrical resistance between the spindle and the machine's body of people's mills and lathes

    Rick
    By body of the machine I assume that you mean to the table of a mill and not to the fixed framework. The table is two moving slides away from the body.

  9. #47
    Supporting Member rgsparber's Avatar
    Join Date
    Nov 2012
    Location
    Phoenix, AZ
    Posts
    1,321
    Thanks
    778
    Thanked 2,840 Times in 670 Posts

    rgsparber's Tools
    Quote Originally Posted by tonyfoale View Post
    By body of the machine I assume that you mean to the table of a mill and not to the fixed framework. The table is two moving slides away from the body.
    Tony,

    I think you will find that the resistance between table and frame is less than 0.1 ohms.

    Rick



    2,000+ Tool Plans
    Rick

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

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