Free 173 Best Homemade Tools eBook:  

User Tag List

Results 1 to 3 of 3

Thread: Moving the ram on a milling machine.

  1. #1
    Supporting Member tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    836
    Thanks
    333
    Thanked 1,388 Times in 415 Posts
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    tonyfoale's Tools

    Moving the ram on a milling machine.

    I was just discussing moving the ram on a Bridgeport with a friend. A while back he had problems moving his and about a week ago I needed to move mine, which is an unusual occurrence. I thought that my solution might be of interest here.

    The ram just didn't want to move and I was fearful of shearing a drive pin (just guessing that there was something like that in there) between the external lever and internal pinion. I placed a bottle jack between the ​table and the head and took the load off the slide. That let me squirt some very thin oil in there, It had been lubricated with grease. I then switched to the rear end, where I added a long lump of wood to the jack to reach from floor to slide, and repeated the oil squirting. It still didn't want to move after removing the jack so I jacked up the front again and managed a small movement with the jack in place and the load off. Then I removed the jack and the ram moved OK, albeit a bit stiff. I cycled it fully several times washing the old lubricant off and putting new on. Smooth as silk now, but for how long? If the ram is not moved for a long period the weight gradually squeezes the lubricant out.

  2. The Following 2 Users Say Thank You to tonyfoale For This Useful Post:

    olderdan (01-04-2018), Paul Jones (01-04-2018)

  3. #2
    Supporting Member olderdan's Avatar
    Join Date
    Jun 2016
    Location
    Devon UK
    Posts
    563
    Thanks
    1,118
    Thanked 1,051 Times in 347 Posts
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    olderdan's Tools
    Good observation on lubricant displacement due to weight, not something that is always considered.
    I am in the habit of rotating my lathe chuck a few times by hand before powering up (plain bearings).

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

    tonyfoale (01-04-2018)

  5. #3
    Supporting Member tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    836
    Thanks
    333
    Thanked 1,388 Times in 415 Posts
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    tonyfoale's Tools
    Quote Originally Posted by olderdan View Post
    Good observation on lubricant displacement due to weight, not something that is always considered.
    I don't know exactly what the weight of the ram and head is on a Bridgeport but guessing I would say near 200 kg. which is supported on an area of 0.032 m^2 so the pressure is g * 200/0.032 = 61.4 kPa. which is very low and hence surprising that it matters in terms of squeezing lubricant. I guess when you apply that pressure for a few years the effect builds up.


    Post your reply!
    Join 42,532 of us and get 100+ tool plans, tool eBooks, build guides, and much more.



    59 Best Homemade VisesTube Bender Build Guide

  6. The Following User Says Thank You to tonyfoale For This Useful Post:

    olderdan (01-04-2018)

Thread Information

Users Browsing this Thread

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

Tags for this Thread

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
  •