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Thread: Slotting and Broaching tool for the Lathe

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    jjr2001's Avatar
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    Slotting and Broaching tool for the Lathe

    I have tried the "no tool method" by just using a cutoff tool in a tool bit holder and that works but it does
    put a lot of stress on the carriage gear train. (Manual Feed Gears). There are a lot of examples on the net
    using a dedicated tool in the tool post. I tried that method but with my little lathe rigidity was missing.
    So I reverted to mounting the new slotting tool with a tool post riser and removing the compound and QCTP.

    The block of aluminum is 3" by 4" and about 1.75" thick. The bushings are 3/4" ID and 1" OD.
    The hole for the bushings was simply bored straight through. I added a hole (set screw plug) in the top
    of the tool body so that I could fill the area surrounding the ram with oil. The bushings were a slip fit and
    then I set them with blue loctite so the oil does not leak out.

    Ram is 3/4 drill rod with factory finish and it is a nice sliding fit in the 3/4" bushings. The handle is 1018 steel
    and is 3/4" wide and 1/4" thick. I used either shoulder screws or allen cap screws for all fasteners. The link is
    a chunk of brass that is kept well lubed in use.

    First trials with it mounted on the riser showed that it would rotate against the riser when high forces were applied.
    I solved that with the little steel clamp that locks the slotting tool block to the riser. Works fine now.

    The boring bar type tool holder was going to be the tool bit holder of choice but after trying my "rota-broach" type
    tool bit I think they will be fine for some types of work.

    There is a test piece in the chuck in a couple of pictures. The nice thing is that this tool will broach out a round hole to
    be square by using one of my square broaches. The square broach can be used internally or externally. I was also able
    to make the square broached hole larger by rotating the chuck 90 degrees and moving the cross slide in a few thou at a time.
    Then by moving the tool up or down with shims the square cut could be enlarged to whatever you wanted. Using the smaller
    tool bit and enlarging the square hole with it will keep the forces lower than if going to a large bit.

    I need to make more tool bits for smaller sizes and will do that next. It looks like the tool will be very useful
    putting keyways in gears and shafts for my model engines.

    Cheers, JR
    Attached Thumbnails Attached Thumbnails Slotting and Broaching tool for the Lathe-img_2473.jpg   Slotting and Broaching tool for the Lathe-img_2458.jpg   Slotting and Broaching tool for the Lathe-img_2468.jpg   Slotting and Broaching tool for the Lathe-img_2475.jpg   Slotting and Broaching tool for the Lathe-img_2476.jpg  

    Slotting and Broaching tool for the Lathe-img_2477.jpg  
    Back to the shop.

  2. The Following 17 Users Say Thank You to jjr2001 For This Useful Post:

    Altair (03-03-2019), baja (03-05-2019), bigtrev8xl (03-05-2019), Daturat100r (03-14-2019), Dimitris Polychronis (03-03-2019), high-side (03-05-2019), Jon (03-03-2019), Metallurg33 (03-10-2019), old_toolmaker (03-03-2019), Paul Jones (03-04-2019), rossbotics (03-03-2019), SA MAKER (03-10-2019), Scotsman Hosie (03-10-2019), Steved53 (03-11-2019), Toolmaker51 (03-04-2019), Tule (03-06-2019), volodar (03-05-2019)

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    rossbotics rossbotics's Avatar
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    Nice setup JR. you did a nice job on your broaching fixture, I been toying with that idea for quiet a while now, you may have just intrigued me !

    Doug
    Comments are always welcome
    Doug

    Subscribe to my you tube channel

    https://www.youtube.com/channel/UCDD..._as=subscriber



    Tool Plans for Sale by rossbotics






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    Thanks Doug, One note about the design. Last night after looking at some builds I found this:

    HomeShopTech

    I like the design and see that it would remove any tendency for rotational movement of the tool.
    Don't think I will make another one since mine does work well. It is easy to take many small cuts to
    reduce rotational forces and is much faster than just using the lathe and cutting bit in the tool post.
    I can take large cuts and with the little clamp added to the riser it does not rotate.

    But who knows, I like to make tools and this "Top Handle" design is a nice variation that solves the rotation problem.

    Cheers, JR
    Back to the shop.

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    rossbotics (03-03-2019)

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    jjr2001,

    Great job on the slotter attachment. What do you use to grind the tools to size? Also what relief angle do you find works best?
    Dick


    Links to some of my plans:

    http://www.homemadetools.net/forum/f...6068#post65876 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

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    jjr2001 (03-03-2019)

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    Dimitris Polychronis's Avatar
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    That’s a really nice tool, thanks for sharing!

    Dimitris

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    Content Editor Altair's Avatar
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    Thanks jjr2001! We've added your Lathe Slotting and Broaching Tool to our Lathe Accessories category,
    as well as to your builder page: jjr2001's Homemade Tools. Your receipt:




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    jjr2001 (03-03-2019)

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    Thanks Dimetris, It was fun to build and will be useful for my model engines.

    Dick, I have a shop made all around grinder, "surface or tool bits, endmils, whatever.
    Here is the link: Shop Assembled Cutter Grinder
    I have replaced the motor and added some things to it but that is my basic tool/surface grinder.
    Fine Feed Add: Universal Grinder Fine Feed Adjuster
    Power table feed: Universal Grinder Power Feed xy table power feed

    Not a show tool but it does get some use in the shop.


    Relief angle for the broaching bits is 12 degrees. I just put it in a 5C collet and that makes it easy to get all 4 sides done.
    Cheers, JR
    Back to the shop.

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    Dimitris Polychronis (03-04-2019), old_toolmaker (03-04-2019)

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    jjr2001,

    That is a nice grinder build and it is nice how you salvaged the old X-Y table. I bet it does all you ask of it.
    Dick


    Links to some of my plans:

    http://www.homemadetools.net/forum/f...6068#post65876 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

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    jjr2001 (03-04-2019)

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    So far it has done everything I have asked of it. It is a nice addition to the home shop.
    Cheers, JR
    Back to the shop.

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    Slotting and Broaching tool for the Lathe
    Quote Originally Posted by jjr2001 View Post
    There are a lot of examples on the net using a dedicated tool in the tool post. I tried that method but with my little lathe rigidity was missing.
    So I reverted to mounting the new slotting tool with a tool post riser and removing the compound and QCTP.
    Cheers, JR
    Finely made manual shaper! I thought ill of 'no tool' method as well, on a Okuma! Stout wonderful machine, but the gear rack ratio is to move a carriage quickly, not grunting leverage.
    That you built a levered post make sense; the force centers better on the compound instead of hanging farther out in space.
    Such tools most people think are only 'small machines - small shop' hobby work. [I won't mention how I dislike word hobby in the context of machine work.]
    Ooops.
    Your post today, like others, makes me think how to use such techniques on substantial equipment too. For starters, I can't see any serious issue boring index holes into edge of chuck back plate.
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

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