Help with a Brown & Sharpe 618 Micromaster
Close
Login to Your Account
Results 1 to 12 of 12
  1. #1
    Join Date
    Sep 2016
    Country
    UNITED STATES
    State/Province
    California
    Posts
    84
    Post Thanks / Like
    Likes (Given)
    7
    Likes (Received)
    10

    Default Help with a Brown & Sharpe 618 Micromaster

    I'm looking at getting a used Brown & Sharp 618 Micromaster. One of the units I saw has the hydraulic table feed but the elevating handwheel jerks quite a bit when you are trying to do fine movements. Also the fine adjustment knob is stiff to the point to where you can bairly move it.

    The other unit I was looking at didn't have that issue but didn't have the hydraulic feed.

    I'm wondering what would cause the elevator wheel to jerk with slight movements. I'm hoping the fine feed worm gear needs to be taken out and cleaned but it might be binding up on metal. I tried test grinding a part and it was very annoying to do the fine movement you would expect when grinding. I could probably live without the hydraulic table feed but I feel if you are getting a grinder and you can get it, you probably will kick your self in the butt later for not getting it.

  2. #2
    Join Date
    Dec 2005
    Location
    Jersey Shore
    Posts
    3,795
    Post Thanks / Like
    Likes (Given)
    276
    Likes (Received)
    442

    Default

    Hydraulic table is VERY usable, downfeed no so much. What needs to be repaired is up in the air. If the table works as normal, means the problem is specific to downfeed. my $0.02

  3. #3
    Join Date
    Jul 2009
    Location
    Peoria, IL
    Posts
    10,651
    Post Thanks / Like
    Likes (Given)
    36
    Likes (Received)
    7915

    Default

    Does it have hydraulic down feed or just table feed? They were available either way. If it's hydraulic, obviously it's more complex. The manual elevating version is very simple.

    You should see a thumb screw on the hand wheel. That's like a clutch. When it's tight, the fine adjust worm gear in engaged. When loose, the fine adjust does not function.

    It's possible the ways are set up too tight and the wheel is not coming down smoothly.

  4. #4
    Join Date
    Oct 2014
    Country
    UNITED STATES
    State/Province
    Maryland
    Posts
    2,476
    Post Thanks / Like
    Likes (Given)
    1278
    Likes (Received)
    1450

    Default

    Quote Originally Posted by SirRage View Post
    I'm looking at getting a used Brown & Sharp 618 Micromaster. One of the units I saw has the hydraulic table feed but the elevating handwheel jerks quite a bit when you are trying to do fine movements. Also the fine adjustment knob is stiff to the point to where you can bairly move it.

    The other unit I was looking at didn't have that issue but didn't have the hydraulic feed.

    I'm wondering what would cause the elevator wheel to jerk with slight movements. I'm hoping the fine feed worm gear needs to be taken out and cleaned but it might be binding up on metal. I tried test grinding a part and it was very annoying to do the fine movement you would expect when grinding. I could probably live without the hydraulic table feed but I feel if you are getting a grinder and you can get it, you probably will kick your self in the butt later for not getting it.
    This might help

    Brown & Sharpe Mfg. Co. - Publication Reprints - 618 Micromaster Surface Grinding Machines | VintageMachinery.org
    Brown & Sharpe Mfg. Co. - Publication Reprints - Replacement Parts Manual for the 618 and 818 Micromaster Series II Surface | VintageMachinery.org

    dee
    ;-D

  5. #5
    Join Date
    Sep 2016
    Country
    UNITED STATES
    State/Province
    California
    Posts
    84
    Post Thanks / Like
    Likes (Given)
    7
    Likes (Received)
    10

    Default

    Cool thanks everyone =)

    Hopefully, it's an easy repair but I'm willing to take that chance.

  6. #6
    Join Date
    Jul 2009
    Location
    Peoria, IL
    Posts
    10,651
    Post Thanks / Like
    Likes (Given)
    36
    Likes (Received)
    7915

    Default

    The weak point of those grinders is the cheesy o-ring belt drive for the spindle and the cross feed nut on the hydraulic version.

  7. #7
    Join Date
    Apr 2011
    Location
    NJ, USA
    Posts
    454
    Post Thanks / Like
    Likes (Given)
    98
    Likes (Received)
    101

    Default

    Not to hijack your thread SirRage, but I too am looking into getting one of these specific grinders.

    In addition to Ewlsey's comment on the belt drive, what other things should be checked out on this machine or on used surface grinders in general?

    The input voltage controls the hydraulic and spindle motor right? IIRC the ones i have used the coolant pump is 110V. Are the motors similar to commercial TEFC motors where they are 230/460 or did these come with fixed voltages?

    One of the other threads mentioned something about shipping with the table off? I have never had one of these machines apart, so although I know they are nice to use, I dont know how nice (or not) they are to work on.

  8. #8
    Join Date
    Jun 2012
    Country
    UNITED STATES
    State/Province
    Michigan
    Posts
    8,127
    Post Thanks / Like
    Likes (Given)
    2352
    Likes (Received)
    2615

    Default

    [is the cheesy o-ring belt drive for the spindle]
    Some had that mostly on the larger machines..The belts drive was very smooth but limited for hogging.. Many of the larger machines also could be ordered with a motorized spindle..

    Don't think I have seen a 618 with belts drive.

    The choppy down feed may be a dirty vertical screw or dirty in the vertical slide. perhaps OK with tear down and cleaning..
    be sure to jog many times if the machine has been setting. That all is clean and lubricated.

    Great machine. one of my favorites..

  9. #9
    Join Date
    Jul 2009
    Location
    Peoria, IL
    Posts
    10,651
    Post Thanks / Like
    Likes (Given)
    36
    Likes (Received)
    7915

    Default

    The 618 was most commonly sold with the o-ring belt drive. There was a direct drive option, but not very common from what I have seen.

  10. #10
    Join Date
    Sep 2016
    Country
    UNITED STATES
    State/Province
    California
    Posts
    84
    Post Thanks / Like
    Likes (Given)
    7
    Likes (Received)
    10

    Default

    I think the direct drive option was for the greater than 1HP models. I think there was a 2HP model and that would have had the direct drive.

  11. #11
    Join Date
    Jun 2012
    Country
    UNITED STATES
    State/Province
    Michigan
    Posts
    8,127
    Post Thanks / Like
    Likes (Given)
    2352
    Likes (Received)
    2615

    Default

    Think 4 standard options the (1)1hp belts drive called the something flex drive, (2)the 1hp direct,(3) 2hp direct,and the(4) 2hp 1800 rpm. Running long hard stock parts one could stall the flex drive machines.Stalling could cause a burning of the part even with coolant in use..
    And I think one could also order a pope direct drive as a special or standard in 3 hp but not sure about that..
    I think the 10-24 and perhaps a few larger machines came with a larger flex drive (may have been a 3hp?) and a 5hp direct ..
    The Micromaster moved the whole motor column as the cross feed with scraped ways on top of the base pallet so it was a very solid machine.Surprising it moved easier that one would expect.Yes the cross and long travel were not on the same slide movement as is a more common design. In good shape a Micromaster could make ring together parts...like jo blocks..
    the 13 grinder used the moving column but scraped into the base not on a pallet..a very common design for many OD grinders.
    I had a 3hp pope installed on a Reid 618 back in the 60s, The old scraped Reid was a good machine also.

  12. #12
    Join Date
    Jul 2009
    Location
    Peoria, IL
    Posts
    10,651
    Post Thanks / Like
    Likes (Given)
    36
    Likes (Received)
    7915

    Default

    There was also a high speed grinding spindle option. I've never seen one, but it's in the manual.


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
  •