Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Page 1 of 2 12 LastLast
Results 1 to 15 of 17
  1. #1
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
    Join Date
    Dec 2011
    Location
    Canberra
    Age
    38
    Posts
    4,467

    Default milling feed rates

    Hi all,
    I have been thinking about the new mill, and I am wondering how best to calculate feed rates? Having a variable knob on the hm50 I just set it to where the cut seemed reasonable. But having a gearbox driven feed, I can't just do that. A bit of googling comes up with a formula, but I don't really know what a reasonable feed per tooth is with hss, its on the insert boxes for the carbide tips .

    The other question I mentioned in the vernier thread was seting the z axis zero on a machine with no quill feed. BT gave me his way, but I'd be interested in any other options, since I probably won't be turning the spindle over by hand too easily! A google and a you tube search has come up with nothing.
    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.

  2. # ADS
    Google Adsense Advertisement
    Join Date
    Always
    Location
    Advertising world
    Age
    2010
    Posts
    Many





     
  3. #2
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    7,775

    Default

    Hi Ewan,

    I set the speed with a table but feeds are something I just guess at. I'm sure most of the time I'm on the slow side but as I am almost always making one offs it doesnt matter much. (yeah I know doesnt help much, pretty sure I have a table somewhere I'll have a look)

    Gets some cigarette papers, stick a little piece to the surface of the workpiece with a little spit, with the mill running feed until the paper moves. Now you are a paper thickness away.
    (ok I just use thin strips of telephone book but most the time I dont care that much. depends what I'm doing.)

    Stuart

  4. #3
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    920

    Default

    That's pretty close to my method, only rather than stick the paper to anything, I hold it in my fingers between the rotating cutter and the job, and slowly advance the slide until it gets snatched away. It's quick and accurate enough for me.
    The cig papers I have now (Rollies) are ~1.3 thou.

    Jordan

  5. #4
    Join Date
    Aug 2007
    Location
    Saskatoon, SK, Canada.
    Posts
    1,366

    Default

    There are free Apps that can help with the feeds and speeds for mills, lathes & drills if you have a smart phone.

    Pete

  6. #5
    Join Date
    Sep 2011
    Location
    Ballarat
    Age
    64
    Posts
    2,659

    Default milling feed rates

    Hi Ewan,
    All will be revealed in a day or so. By the way, I love your filthy weather. Just bracing for another storm.

    Phil

  7. #6
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
    Join Date
    Dec 2011
    Location
    Canberra
    Age
    38
    Posts
    4,467

    Default

    Quote Originally Posted by Steamwhisperer View Post
    Hi Ewan,
    All will be revealed in a day or so. By the way, I love your filthy weather. Just bracing for another storm.

    Phil
    I ordered the weather just for you Phil, but todays storm was nothing on yesterdays......

    Pete, I have an android phone, i'll have a look at the apps available.
    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.

  8. #7
    Join Date
    Aug 2011
    Location
    Melbourne
    Posts
    2,951

    Default

    My method is probably totally irrelevant but I'll bounce it off anyway. I just use a 1.0mm feeler gauge between the mill and the workpiece, turning the spindle by hand though. I then zero the Z DRO, advance another 1.00mm, zero and it's at datum.

    I'm yet to use the method on dimensionally critical projects but I hazard a guess that it's probably not the correct method. I must admit I have not checked the thickness of the feeler gauge with a micrometer either! It says 1.0mm on the feeler gauge, does that count?

    Hey Ueee, you have a HM50? These are a knee mill and so no quill downfeed? Is it easier making the height adjustment with a knee mill compared to a gear head mill?

    In any case, paper sounds like a better idea, just have to be a little more careful in advancing the quill.

    OH, WRT feed rates, I'm the same as Stuart, I start off slow and dial up as required. My feed rates are very very slow compared to what I probably could do but hey, who's looking at the clock anyway!

    On the lathe however (fixed gearbox rate some as your mill) I fine tune the feed rates while I'm roughing, that way if it's too fast and I don't like the finish, I always get to have another go at it!

    It may seem slack but I never look up feed rates especially when turning (mill is different), I now have a fair idea what feels right and whats too fast for my machine. As stated above, I pretty much always err on conservative feed rates.

    Simon

  9. #8
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
    Join Date
    Dec 2011
    Location
    Canberra
    Age
    38
    Posts
    4,467

    Default

    Quote Originally Posted by simonl View Post
    Hey Ueee, you have a HM50? These are a knee mill and so no quill downfeed? Is it easier making the height adjustment with a knee mill compared to a gear head mill?
    For now anyway......They have a quill Simon, can be fed with a "fine" downfeed handwheel or just like a DP.

    It will probably go once Miss V (still unamed, although Miss V has a certain ring...she is certainly young compared to her company) is up and running properly. Not enough space, I'd rather look for a little surface grinder to take up space then it.

    So if anyone wants a HM50.......
    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.

  10. #9
    Join Date
    Jun 2007
    Location
    sydney
    Age
    63
    Posts
    3,566

    Default

    Have you been able to find out the feed per tooth yet for different material.

  11. #10
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
    Join Date
    Dec 2011
    Location
    Canberra
    Age
    38
    Posts
    4,467

    Default

    I have found this http://www.uddeholm.com/files/Cuttin...Corrax_eng.pdf which has the data and formula required. I also got a few apps to try, at this stage one called boncopeauX seems the go. Some of the manufactures have apps but these seem to be aimed at production work, and are not so useful for us.
    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.

  12. #11
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    70
    Posts
    5,650

    Default

    Quote Originally Posted by Ueee View Post
    For now anyway......They have a quill Simon, can be fed with a "fine" downfeed handwheel or just like a DP.

    It will probably go once Miss V (still unamed, although Miss V has a certain ring...she is certainly young compared to her company) is up and running properly. Not enough space, I'd rather look for a little surface grinder to take up space then it.

    So if anyone wants a HM50.......
    Would Mademoiselle (abbreviated as Mlle) be more appropriate?

    Bruce gave me some 1/2" wide 0.0005" paper on a beautiful little wooden bobbin he made. Great for getting just that little bit closer without the cutter touching and marking the job. More applicable for moving the Y for centring.

    BT

  13. #12
    Join Date
    Sep 2011
    Location
    Ballarat
    Age
    64
    Posts
    2,659

    Default milling feed rates

    First off I would like to say a mighty big thanks to Ueee for showing me around his shed today. A thorough gentleman. One thing I did forget to tell you was about 'wigglers' and 'edge finders'. I have used these in the past to find an edge then move away a set distance to insert the cutter. I mainly use the cigarette paper now and call it about one and a half thou.
    Thanks again for your hospitality and damn, that Queen City shaper is big.

    Phil

  14. #13
    Join Date
    Oct 2008
    Location
    N.W.Tasmania
    Posts
    703

    Default Some K&T thoughts on the matter.

    Hi Ewan, congratulations on your most impressive new addition, (especially when price is considered), I suspect that it would have been good buying at 10 times the price, and just shows what is possible if you are patient, and keep your eyes and ears open. It also helps to have some great mates letting you know what is around too
    As I have yet to take delivery of a milling machine , you may wish to take with a grain of salt, my thoughts on milling, but in the absence of wigglers or other edge finding devices, thin paper, tally ho's, old phone book or whatever sounds like standard practice from years ago, and I seem to recall reading that even marking out blue has been used, but as it is only a couple of tenths of a thou thick, you sure would have to sneak up carefully if you were not to mark the work piece.
    Some time ago I downloaded a K&T manual and if you are interested and feel that it may prove useful, I will try to find the link for you, but in the meantime I will post the relevant pages on their take on feeds and speeds circa 1940. All the best,
    Rob.P1030842.jpgP1030848_2.jpgP1030847_2.jpg

  15. #14
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
    Join Date
    Dec 2011
    Location
    Canberra
    Age
    38
    Posts
    4,467

    Default

    Thank you Rob.

    Phil, after you kind words above I decided to order some nicer weather for us today, does it suit?

    Just spoke to my transport guy and we will be moving her this arvo. Yes Bob, there will be plenty of Melbourne's.

    Better get my real work done so I can get home and finish clearing the space for her.
    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.

  16. #15
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    70
    Posts
    5,650

    Default Treatise on Milling

    Ewan,

    I'm not trying to ant Rob's offer of a link to the Kearney and Trecker tome but I have two copies of Brown and Sharpe's Treatise of a similar vintage to the K and T. The treatise deals with the setting up and use of some serious machines, Vernier scale.

    If you are interested I am happy to post you over one.

    BT
    Last edited by Anorak Bob; 9th January 2013 at 11:15 PM. Reason: spelling

Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 8
    Last Post: 11th September 2012, 08:11 PM
  2. Milling feed rates
    By 19brendan81 in forum METALWORK FORUM
    Replies: 29
    Last Post: 29th October 2010, 05:17 PM
  3. speed feed and cut rates
    By tanii51 in forum METALWORK FORUM
    Replies: 7
    Last Post: 25th October 2009, 10:23 PM
  4. Rates of pay
    By Smurf in forum EMPLOYMENT
    Replies: 10
    Last Post: 21st March 2008, 09:08 PM
  5. IN FEED OUT FEED Attachment.
    By Ticky in forum BANDSAWS
    Replies: 6
    Last Post: 13th June 2007, 12:59 PM

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
  •