Free 50 Best Homemade Tools eBook:  
Remove advertisements
Results 1 to 3 of 3

Thread: Moving the ram on a milling machine.

  1. #1
    [email protected] tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    480
    Thanks
    206
    Thanked 783 Times in 251 Posts

    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
    olderdan's Avatar
    Join Date
    Jun 2016
    Location
    Devon UK
    Posts
    385
    Thanks
    823
    Thanked 702 Times in 248 Posts

    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
    [email protected] tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    480
    Thanks
    206
    Thanked 783 Times in 251 Posts

    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 33,912 of us and get our 50 Must Read Homemade Tools eBook free.



    50 Must Read Homemade Tools

  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
  •