Thanks Thanks:  0
Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Page 2 of 2 FirstFirst 12
Results 16 to 20 of 20
  1. #16
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    Quote Originally Posted by variant22 View Post
    Eskimo you are not alone. I recently purchased an AL960b. Having a play on the weekend I managed to bust my cheap "freebie" HAFCO parting/grooving tool. Working with 1045 steel @50 diameter. I decided on my second use a the lathe (ever) that I would conquer the parting issues "up front". At least that was my plan. Instead the tool and the 1045 had other ideas. I found it was cutting great, chips flying in small spirals, then a loud chatter noise. I pulled out and noticed some steel stuck in the groove. I decided to part down the other side thinking this would create a clear swarf part. Instead when it got to the chatter part (deep - 20mm at least) it broke..

    Attachment 307769 Attachment 307768 Attachment 307770 Attachment 307771

    I see you are right at the chuck so it should have worked ???..wonder why it didnt..we need lessons eh?..or trial n error times

    I was about 3-1/2 in away on 1/2 dia when I was doing it...certainly not in any way semi rigid even with a live centre I'd say. I am taking all this in for when I need to do it again.

  2. #17
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    Quote Originally Posted by racer123 View Post
    I was always told not to use a centre when parting. The bar flexes and pinches the parting tool in the cut.
    Also as fast as you can go for that diameter and carbide parting tool.
    I try to part at most 1/2 inch out from the chuck.
    David
    Thats what I'll be trying next time David..closer to chuck and see what happens

  3. #18
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    Quote Originally Posted by krisfarm View Post
    eskimo,
    A rear mounted parting tool with a good supply of lubrication will solve nearly all of the problems. Speed and feed and tool on centre will handle the rest.
    Bob
    is that one of those from Eccentric Bob?

    I'll do a google incase its not..ta

    its not..
    but i see you need the room etc to mount one.

    can one be fitted to front and run in reverse to acheive same loading effects?

  4. #19
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
    Join Date
    Dec 2011
    Location
    Canberra
    Age
    39
    Posts
    4,515

    Default

    Quote Originally Posted by racer123 View Post
    I was always told not to use a centre when parting. The bar flexes and pinches the parting tool in the cut.
    Also as fast as you can go for that diameter and carbide parting tool.
    I try to part at most 1/2 inch out from the chuck.
    David
    Hi David,
    I have never considered the problems with using a center, but it makes perfect sense.
    I have used the traveling steady to good effect when i have wanted to part further from the chuck. I think on smaller lathes though you are asking for extra problems with carbide, i would just use HSS on a lighter, less rigid machine.

    Quote Originally Posted by eskimo View Post
    is that one of those from Eccentric Bob?

    I'll do a google incase its not..ta

    its not..
    but i see you need the room etc to mount one.

    can one be fitted to front and run in reverse to acheive same loading effects?
    The eccentric one is exactly that, an upside down one that you use in your normal toolpost with the lathe in reverse. Not good for screwed spindle noses though.

    As far as speed goes, I tend to keep it fairly low, 400rpm is a nice starting point. On the Antrac i will go to 720 once the dia drops but no faster. I am currently using a 4mm wide Iscar tool. I had a 2mm but the tips just kept breaking on the bigger lathe.

    Andre and i were discussing surface speeds when he was down a few months ago. He was saying that at work they use carbide but part really slowly, 200rpm comes into my mind. Not sure on the job sizes though.

    For fast parting check this out: https://www.youtube.com/watch?v=YYs-Q1FQ-q8
    If you can get past the fact that its a bit of square in a 3 jaw it pretty amazing.....

    Ew
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

  5. #20
    Join Date
    Apr 2009
    Location
    Ballina N.S.W.
    Posts
    644

    Default

    Hi eskimo
    My rear parting tool is one I made up myself. The Eccentric Engineering ones would work as well the principle is the same. I just felt having one mounted ready to go saves a bit of time, I always seem to need to part off most jobs. I run my lathe at 500-700 RPM when parting 25mm dia steel. For 50mm dia around 350RPM both with power feed on slowest setting and plenty of lubrication-see pictures. Part as close to the chuck as possible.That guy in the video parting a square bar held in a three jaw chuck is looking for trouble that would not be far away.
    Bob



    Quote Originally Posted by eskimo View Post
    is that one of those from Eccentric Bob?

    I'll do a google incase its not..ta

    its not..
    but i see you need the room etc to mount one.

    can one be fitted to front and run in reverse to acheive same loading effects?
    Attached Images Attached Images

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Parting off tool ?
    By morrisman in forum METALWORK GENERAL
    Replies: 5
    Last Post: 10th Oct 2013, 11:36 AM
  2. Your best parting tool
    By iron bark in forum METALWORK GENERAL
    Replies: 61
    Last Post: 20th Dec 2012, 07:40 PM
  3. On parting and rear mounted parting tools
    By Michael G in forum METALWORK GENERAL
    Replies: 8
    Last Post: 20th Oct 2012, 03:17 AM

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
  •