Free 186 More Best Homemade Tools eBook:  
Get 2,000+ tool plans, full site access, and more.

User Tag List

Page 1 of 2 1 2 LastLast
Results 1 to 10 of 12

Thread: Slotting Saw Arbor for Unimat

  1. #1
    Supporting Member Paul Jones's Avatar
    Join Date
    May 2014
    Location
    Del Mar, California
    Posts
    1,231
    Thanks
    5,810
    Thanked 1,440 Times in 655 Posts

    Paul Jones's Tools

    Slotting Saw Arbor for Unimat

    I had been using a commercially available slotting saw arbor (Enco part 370-9050) held in a 3-jaw chuck for cutting slots with my Unimat milling head (see Homemade Lathe Modifications ). I made a new slotting saw arbor that threads directly onto the spindle.

    The arbor uses 12L14 steel hex bar that is 1.25” across the flats. One end has an internal thread of M12X1 to fit the Unimat spindle and the other end has a ½-20 internal thread for a flat head hex screw. The hex shape plus two holes for 4mm tommy bars allow easy setup and removal. I use mainly 1/32" and 1/16" thick HSS slotting saw blades with 0.875” hole and keyway slot. The nose of the arbor has a 0.8745” diameter step and a matching end cap that retains the slotting saw blade. I used part of a 0.070” dia. hardened pin from an old minicomputer paper tape punch for the blade retaining pin. Also removed 0.050” from the top of the flat head hex screw to allow it to seat below the end cap.

    By the way, for the Unimat purists, the arbor and end cap could have been made completely on the Unimat like I did for the milling cutter holders (see Homemade Milling Cutter Holders ). However, this time I used my 12” swing geared-head lathe to machine the countersink on the end cap but the rest of the arbor was machined on the Unimat.
    Attached Thumbnails Attached Thumbnails Slotting Saw Arbor for Unimat-cutting-slot-into-clamping-screw-head.jpg   Slotting Saw Arbor for Unimat-cutting-slot-into-clamping-screw-head.jpg   Slotting Saw Arbor for Unimat-slotting-saw-arbor-unimat-side-view.jpg   Slotting Saw Arbor for Unimat-slotting-saw-arbor-unimat-sl.jpg   Slotting Saw Arbor for Unimat-slotting-saw-arbor-unimat-parts-blade.jpg  

    Slotting Saw Arbor for Unimat-slotting-saw-arbor-unimat-parts.jpg   Slotting Saw Arbor for Unimat-slotting-saw-arbor-unimat-locking-pin.jpg   Slotting Saw Arbor for Unimat-machining-bottom-recess-slotting-saw-arbor-cap.jpg   Slotting Saw Arbor for Unimat-machining-clamping-cap-slotting-saw-arbor.jpg   Slotting Saw Arbor for Unimat-parting-off-catching-slotting-saw-arbor-clamp-cap.jpg  


    186 More Best Homemade Tools eBook
    Last edited by Paul Jones; Sep 9, 2016 at 11:33 PM.

  2. The Following 4 Users Say Thank You to Paul Jones For This Useful Post:

    Jon (Oct 22, 2015), kbalch (Oct 23, 2015), nevadablue (Oct 23, 2015), PJs (Oct 23, 2015)

  3. #2
    Content Editor
    Supporting Member
    DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,056
    Thanks
    772
    Thanked 1,850 Times in 1,652 Posts
    Thanks Paul Jones! We've added your Slotting Saw Arbor to our Milling category, as well as to your builder page: Paul Jones' Homemade Tools. Your receipt:


    2000 Tool Plans

  4. #3
    Supporting Member Catfish's Avatar
    Join Date
    Oct 2013
    Location
    Mariposa, California
    Posts
    268
    Thanks
    55
    Thanked 414 Times in 156 Posts

    Catfish's Tools
    Nicely done Paul.

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

    Paul Jones (Oct 23, 2015)

  6. #4
    Supporting Member bstanga's Avatar
    Join Date
    Sep 2015
    Posts
    80
    Thanks
    1
    Thanked 168 Times in 52 Posts

    bstanga's Tools
    very clean, nicely done

  7. The Following User Says Thank You to bstanga For This Useful Post:

    Paul Jones (Oct 23, 2015)

  8. #5
    PJs
    PJs is offline
    Supporting Member PJs's Avatar
    Join Date
    Sep 2014
    Location
    Northern CA
    Posts
    1,841
    Thanks
    8,333
    Thanked 1,118 Times in 718 Posts

    PJs's Tools
    Beautiful work and finishes, Paul. All that dampening work you did really paid off even on Leadloy! The internal M12 & 1/4-28 threads are gorgeous. Did you do those with a tap or SP them? Also admired trimming the head of the FHCS for the recess and re-purposing the pin! Great build, well thought out and execution! Thanks! ~PJ
    ‘‘Always do right. This will gratify some people and astonish the rest.’’
    Mark Twain

  9. #6
    Supporting Member Paul Jones's Avatar
    Join Date
    May 2014
    Location
    Del Mar, California
    Posts
    1,231
    Thanks
    5,810
    Thanked 1,440 Times in 655 Posts

    Paul Jones's Tools
    PJs,

    Thank you for the compliments. Yes, all the anti-vibration work on the 12" swing gear-head lathe has proven successful. Turning 1018 CRS would have looked just as nice as the 12L14. I used a single point tool for the 1/2-20 threads and a tap for the M12X1. My lathe quick change gear box can select metric threads but I am still missing a 30 tooth conversion gear and will have to modify it similar to the my 40 tooth replacement gears ( Homemade Change Gears ).

    Thanks for reminding me about the FHCS. This was another part not totally machined on the Unimat. My 7" swing mini lathe is now dedicated with an ER32 collet holder and is used primarily for collet work like trimming the head of the FHCS.

    Thank you,
    Paul Jones

  10. The Following User Says Thank You to Paul Jones For This Useful Post:

    PJs (Oct 23, 2015)

  11. #7
    PJs
    PJs is offline
    Supporting Member PJs's Avatar
    Join Date
    Sep 2014
    Location
    Northern CA
    Posts
    1,841
    Thanks
    8,333
    Thanked 1,118 Times in 718 Posts

    PJs's Tools
    My bad on the 1/2-20...trifocals (knew it was fine pitch from the pic..wrong ball park), but great threads in both cases. I've wanted an MT3 ER set for mine for quite a while now for more precision. Been curious about the LMS set...good price. Nice to know you still have a purpose for the peanut.

    Thanks for the link...Really nice gears you put together...sorry I missed it before for some reason. That is quite a range of threads! ~PJ
    ‘‘Always do right. This will gratify some people and astonish the rest.’’
    Mark Twain

  12. #8
    Supporting Member Paul Jones's Avatar
    Join Date
    May 2014
    Location
    Del Mar, California
    Posts
    1,231
    Thanks
    5,810
    Thanked 1,440 Times in 655 Posts

    Paul Jones's Tools
    PJs,

    I just reviewed my old article about modifying the 40T gears and looked again at the photo of the lathe quick change gear box diagram. I wish I had looked a little closer at the left-hand side diagram because the I could have cut a 1mm pitch thread with the existing 40T gears but have to reverse the lower 40T gear to get the 127/120 ratio.

    The 30T gear just provides more typical metric thread pitches. The only challenge with cutting metric threads on this lathe is that the split nut has to stay engaged and the motor reversed for each threading pass.

    Paul
    Last edited by Paul Jones; Sep 9, 2016 at 11:42 PM.

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

    PJs (Oct 24, 2015)

  14. #9
    PJs
    PJs is offline
    Supporting Member PJs's Avatar
    Join Date
    Sep 2014
    Location
    Northern CA
    Posts
    1,841
    Thanks
    8,333
    Thanked 1,118 Times in 718 Posts

    PJs's Tools
    Went back and looked also...basically it looks to me if you had a 30 and 32 you would be set to do any metrics. Personally I haven't used but about 5-6 on that list but the comfort of being able to maximize the machines capability is comforting...to me anyway. That is a challenge with the split nut/reverse under power but I have been considering after my latest foray into SPT to finally build a crank for mine and do them by hand...obviously long threads would be a challenge but most of my stuff is an inch or under. Your big lathe may be more problematic to reach though. Thanks again for sharing! ~PJ
    ‘‘Always do right. This will gratify some people and astonish the rest.’’
    Mark Twain

  15. The Following User Says Thank You to PJs For This Useful Post:

    Paul Jones (Oct 24, 2015)

  16. #10
    Supporting Member Paul Jones's Avatar
    Join Date
    May 2014
    Location
    Del Mar, California
    Posts
    1,231
    Thanks
    5,810
    Thanked 1,440 Times in 655 Posts

    Paul Jones's Tools
    PJs
    The new slotting saw arbor is the better and safer way to do this work on my small Unimat. Previously, I had used a commercially available slotting/slitting saw arbor held in my Unimat 3-jaw chuck but there was no way to prevent it from coming loose. I do not recommend doing the cutting this way as shown in the photo. The new arbor will make this work safer to do.
    Paul
    Attached Thumbnails Attached Thumbnails Slotting Saw Arbor for Unimat-machining-5-mm-brass-key-using-unimat-28t-slitting-saw.jpg   Slotting Saw Arbor for Unimat-machining-brass-key-using-unimat-28t-slitting-saw.jpg  

  17. The Following User Says Thank You to Paul Jones For This Useful Post:

    PJs (Oct 24, 2015)

Thread Information

Users Browsing this Thread

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

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
  •