Free 173 Best Homemade Tools eBook:  
Results 1 to 7 of 7

Thread: 5" Sine Bar

  1. #1
    Supporting Member rossbotics's Avatar
    Join Date
    Dec 2013
    Location
    Oregon
    Posts
    709
    Thanks
    943
    Thanked 1,422 Times in 393 Posts

    rossbotics's Tools

    5" Sine Bar

    I was going to buy one of these off e-bay, there really cheap, around $30.00 or so, the real good ones are any where from $80.00 -$300.00.
    The cheaper ones aren't that accurate, a friend of mine got one and checked it and it was within .002-.004 all over, not very accurate if you ask me, but I guess for some people that might be just fine, But for me that wasn't good enough, And I wasn't going to pay big bucks for one either so I decided to make my own.

    I started with a piece of 1.00" X 1.50" X 5.81" O1 tool steel, Milled it all over to it's basic geometry to within about .015" of the finished size, Then I took a piece of .750" O1 drill rod and made the two cylinders, I sawed a thin piece of the 1 x 1.5 flat stock 1/4" long for the stop, Milled it to within about .015 of it's finished size as well.

    Then came the heat treating process, I hardened everything to maximum hardness then tempered them, I would say there around 55 RC, A file just glides over the parts.

    Meanwhile the bearings in the surface grinder are warming up, I ground the sine bar and the stop all over flat parallel and square except for the two shoulders the cylinders seat on, I sat the bar vertical in my Brown and Sharpe 3" tool makers vise and ground one shoulder and end, I stacked up my gage blocks to 4.2540" then set the one tenth indicator up in the surface gage, put it on top of the blocks and zeroed it in. I very carefully ground and checked, ground and checked until I was +.0001 TIR. I then ground the end of the bar and it was finished !

    I ground carefully the two cylinders to .7460" - .7459" I installed the two cylinders on the bar with four 8-32 SHCS
    Then I sat the bar on it's cylinders onto the magnetic chuck and ground the top of the bar one more time, Installed the stop and it was finished.

    Below are some photos
    Thanks for looking and happy machining

    Doug
    5" Sine Bar-bar.jpg
    5" Sine Bar-bar1.jpg
    5" Sine Bar-bar2.jpg
    5" Sine Bar-bar3.jpg
    5" Sine Bar-bar4.jpg
    Last edited by rossbotics; 03-19-2016 at 07:54 PM.

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

    kbalch (09-09-2014), Paul Jones (09-10-2014)

  3. #2
    kbalch's Avatar
    Join Date
    Jun 2012
    Location
    Clermont, FL
    Posts
    5,034
    Thanks
    2,275
    Thanked 516 Times in 375 Posts
    Thanks rossbotics! I've added your Sine Bar to our Milling and Measuring and Marking categories, as well as to your builder page: rossbotics' Homemade Tools. Your receipt:


  4. #3
    Content Editor
    Supporting Member
    DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,091
    Thanks
    462
    Thanked 987 Times in 910 Posts
    Very nice - and great writeup. Looks simple, but reading through your post shows how it should be done!

  5. The Following User Says Thank You to DIYer For This Useful Post:

    Paul Jones (09-10-2014)

  6. #4
    Supporting Member Paul Jones's Avatar
    Join Date
    May 2014
    Location
    Del Mar, California
    Posts
    1,179
    Thanks
    5,327
    Thanked 1,297 Times in 622 Posts

    Paul Jones's Tools
    Very precision work and good looking sine bar. I especially like your explanations and sharp photos. Thank you for sharing.

  7. #5
    Content Editor
    Supporting Member
    Altair's Avatar
    Join Date
    Aug 2013
    Posts
    1,065
    Thanks
    534
    Thanked 1,642 Times in 509 Posts
    Excellent precision work and writeup Doug. Thanks for sharing.

  8. #6
    Supporting Member Paul Jones's Avatar
    Join Date
    May 2014
    Location
    Del Mar, California
    Posts
    1,179
    Thanks
    5,327
    Thanked 1,297 Times in 622 Posts

    Paul Jones's Tools
    Very nice and precise work on the sine bar. It is something to keep forever and feel good whenever you use it. Thanks for the details on how it was ground.

    Paul

  9. #7
    Supporting Member Hotz's Avatar
    Join Date
    Feb 2013
    Location
    South of Brazil.
    Posts
    360
    Thanks
    157
    Thanked 71 Times in 50 Posts

    Hotz's Tools
    Very nice work thanks for sharing.


    Post your reply!
    Join 41,949 of us and get our 173 Must Read Homemade Tools eBook free.



    173 Must Read Homemade Tools
    Sorry my mistakes in english.
    to share your tip >>> http://www.homemadetools.net/forum/tool-tips-tricks/ <<<

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
  •