Free 186 More Best Homemade Tools eBook:  
Get tool plans

User Tag List

Page 1 of 2 1 2 LastLast
Results 1 to 10 of 16

Thread: Crankshaft grinding - video

  1. #1
    Supporting Member Altair's Avatar
    Join Date
    Aug 2013
    Posts
    12,020
    Thanks
    1,365
    Thanked 30,313 Times in 9,998 Posts

    186 More Best Homemade Tools eBook

  2. The Following 3 Users Say Thank You to Altair For This Useful Post:

    johncg (Apr 16, 2021), marksbug (Apr 18, 2021), nova_robotics (Apr 15, 2021)

  3. #2
    Supporting Member tonyfoale's Avatar
    Join Date
    Nov 2016
    Location
    Spain
    Posts
    1,607
    Thanks
    721
    Thanked 2,706 Times in 726 Posts

    tonyfoale's Tools
    I could only watch a couple of minutes of it. The camera movements destroyed any chance that I could watch more. Tripods are not expensive but just a steady hand would help a lot.

    2,000+ Tool Plans

  4. #3
    Supporting Member
    Join Date
    Mar 2021
    Location
    SE PA, USA
    Posts
    25
    Thanks
    0
    Thanked 7 Times in 7 Posts
    I remember when the one automotive machine shop in the small town where I grew up got a crankshaft grinder back in the mid ‘70s. I worked at a local garage and had to drop something off at the machine shop one day, since I was friendly with the guys that worked in the shop I had access to the inner sanctum and got to see it in operation. Amazing watching the crankshaft spin off center while grinding the rod journals.

  5. #4
    Supporting Member hemmjo's Avatar
    Join Date
    Feb 2017
    Posts
    2,665
    Thanks
    251
    Thanked 1,514 Times in 855 Posts

    hemmjo's Tools
    I agree the video is hard to watch, but the real crime happens 10:14 into it. He says says "We're not Rick Hendrick here, this isn't Robert Yates...a thousandth or two is not going to do anything..."

    I could put up with the bad camera work, but not that attitude.

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

    Frank S (Apr 16, 2021), marksbug (Apr 18, 2021)

  7. #5
    Supporting Member Frank S's Avatar
    Join Date
    Aug 2015
    Location
    Peacock TX
    Posts
    11,634
    Thanks
    2,186
    Thanked 9,134 Times in 4,366 Posts

    Frank S's Tools
    Quote Originally Posted by hemmjo View Post
    I agree the video is hard to watch, but the real crime happens 10:14 into it. He says says "We're not Rick Hendrick here, this isn't Robert Yates...a thousandth or two is not going to do anything..."

    I could put up with the bad camera work, but not that attitude.
    attitudes like that guy had is exactly why they will never get to do the ultra high performance grinding I wouldn't want to see what he does with camshafts.
    While technically he is correct being off a thousandth here or a thousandth there may be acceptable for a regrind everything become accumulative. If the cumulative amount of half a millimeter off in a series of holes in red iron can be enough to cause a beam to be rejected on a super tall building, then blasé' attitude of the total or 8 to 10 thou on a shaft spinning several thousand RPMs is not something I want to hear from the guy grinding my crankshafts even if it will not cause failure
    Last edited by Frank S; Apr 16, 2021 at 08:40 AM.
    Never try to tell me it can't be done
    When I have to paint I use KBS products

  8. #6
    Supporting Member Toolmaker51's Avatar
    Join Date
    Feb 2016
    Location
    Midwest USA
    Posts
    5,334
    Thanks
    7,044
    Thanked 3,011 Times in 1,900 Posts

    Toolmaker51's Tools
    There is a point "we're not_______, this isn't ______" is the very edge of OK or not. I've talked to guys just like in the video, declaring themselves 'Machinists'?
    In reality, most are little more than operators. Controlling machines and part results is one thing, if the machine is purpose-built, not so impressive.
    Obviously, I'm not discounting the men like Jenkins, Yunick, Black, Pink, Nicholson, Rollings, the Unsers...
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

  9. #7
    Supporting Member marksbug's Avatar
    Join Date
    Apr 2016
    Posts
    1,939
    Thanks
    775
    Thanked 382 Times in 308 Posts
    yup he needs another job.as well as the grinding rock needs segmented so it dont burn the thrust serfaces. there are way to many "good enough" machinist out there.and almost good enough guys too. I made a very good living fixing the **** work they did. as well as machining and building totaly new assemblys. cars,trucks,jet skis,offshore race boats, drag cars, dirt track cars circle jerkers,most everything even some aero plane stuff. good enough isant good enough.
    he finds .008" stroke difference...or did he? is he off that much?or off .004 or .006" square deck the block and you will know for sure just how bad he effed it up.as well as indexing. do it right, do it 1 time and be done, forget about it and have fun.

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

    hemmjo (Apr 18, 2021), Toolmaker51 (Apr 18, 2021)

  11. #8
    Supporting Member Toolmaker51's Avatar
    Join Date
    Feb 2016
    Location
    Midwest USA
    Posts
    5,334
    Thanks
    7,044
    Thanked 3,011 Times in 1,900 Posts

    Toolmaker51's Tools
    Doing this one right, is the ONLY way to sell the next job.
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

  12. #9
    Supporting Member marksbug's Avatar
    Join Date
    Apr 2016
    Posts
    1,939
    Thanks
    775
    Thanked 382 Times in 308 Posts
    no, they do it all day long.and 98% of the people having it done, do not know 1 that it isant right 2, that it matters,3, how to check it.4 that it can be done right...5 dont give a **** how it is done or looks...and more.

  13. The Following User Says Thank You to marksbug For This Useful Post:

    Toolmaker51 (Apr 18, 2021)

  14. #10
    Supporting Member marksbug's Avatar
    Join Date
    Apr 2016
    Posts
    1,939
    Thanks
    775
    Thanked 382 Times in 308 Posts
    the sad thing is.... way to many good cranks get ****ed up when they did not need and should not of been turned....just go by a local auto machine shop that does crank grinding and have a look at the stack of good cranks awaiting thier time to get ****ed up....grind it and loose the hardening.along with the precision it was made with. most all bearaing are availble is .001"~.003 if you only look.and yes you can mix and match to get the clearance you want.just dont get the uppers and lowers mixed up...some are specific...some arnt. also many times reconing the rods you can put them on the low side to tighten it up a little.as well as seprate main cap engines can be adjusted too. Im a big fan of thin synthetic oils I like tight clearance.as well as all my bearings and most other engine componets get either ceramic coated or DFL coatings. they work oh so awesome!!!
    most cranks need a light fine/mirrior polish, deburing, balancing,chamfering oil gally holes.and cleaning good proper cleaning.and of coarse lightening before balancing.....for performance stuff.
    Last edited by marksbug; Apr 19, 2021 at 10:36 AM.

Thread Information

Users Browsing this Thread

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

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
  •