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Thread: So last week

  1. #1
    Join Date
    Sep 2012
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    Talking So last week

    Hi Guys,

    Well after playing about with my machinists level and needing to make a knurled knob to adjust it with, I only had a bump knurler, which I'm anything but happy with using due to the great strain it puts on the lathe spindle. I decided that I ought to do something about that. So I've spent a few hours in the workshop making a pinch or clamp knurling tool. Here is the finished product. It is all made from scrap that was in the bin. The only bits that were not are the knurling wheels that came from the bump knurler and some 1/4" diameter silver steel used to make the hinge pins. The adjusting knob was knurled using the finished knurler. I just used a nut as a temporary adjuster.

    So last week-14022015-2-jpg So last week-14022015-1-jpg So last week-14022015-3-jpg So last week-14022015-5-jpg

    The arms are 20 X 10 X 75 mm flat bar, drilled and reamed 1/4". The support plate is 60 X 30 X 6 mm plate. All the screws and threaded rod are M6. The brass adjusting knob is 30 X 15 mm with the bottom tapered so that the knurled edge is 10 mm wide. The two round bits of bar are 10 mm diameter by 20 mm long. The M6 threaded rod is locktighted into the lower piece of round bar threaded through the middle M6. I used two M6 cap screws to secure the holding bar that fits into the lathe tool holder. The slots in the ends of the arms were cut with a suitable slitting saw.
    Attached Images Attached Images
    Best Regards:
    BaronJ.

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  3. #2
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    Default

    Hi Baron,
    nice job.
    Did you harden the silver steel pins or was it used purely for the dimensional accuracy.

    Phil

  4. #3
    Join Date
    Nov 2008
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    BJ, you make it look easy.

    A compression spring slipped over the screw might make adjustment a little bit simpler. If you decide you need different pitch or pattern wheels, have a look on US eBay for wheels. Reed, Form Rol, Accu Trak,and Brown and Sharpe, among others make high quality wheels that can be found often for low prices. I bought English wheels made by Woodside Die Sinking when I made a clamp tool some years back. They weren't cheap.


    Here is a link that may be of interest. http://www.formrolldie.com/

    Accu Trak have a pdf that is pretty informative also.


    BT

  5. #4
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    Sep 2012
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    Quote Originally Posted by Steamwhisperer View Post
    Hi Baron,
    nice job.
    Did you harden the silver steel pins or was it used purely for the dimensional accuracy.

    Phil
    Thanks:

    I used the original hardened steel pins in the knurls and silver steel in the hinges. I had thought about hardening them, but yes dimensional accuracy. Particularly since I have a 1/4" reamer to hand.

    All the holes were drilled 6 mm initially because I did suspect that when I cut the slots the legs would pull slightly, which they did. So reaming them to size afterwards was the right thing to do. Though the pins were a good push fit, they would have to be pressed out if I needed to remove them.
    Best Regards:
    BaronJ.

  6. #5
    Join Date
    Sep 2012
    Location
    Yorkshire UK
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    Quote Originally Posted by Anorak Bob View Post
    BJ, you make it look easy.
    Thanks Bob.

    A compression spring slipped over the screw might make adjustment a little bit simpler. If you decide you need different pitch or pattern wheels, have a look on US eBay for wheels. Reed, Form Rol, Accu Trak,and Brown and Sharpe, among others make high quality wheels that can be found often for low prices. I bought English wheels made by Woodside Die Sinking when I made a clamp tool some years back. They weren't cheap.


    Here is a link that may be of interest. http://www.formrolldie.com/

    Accu Trak have a pdf that is pretty informative also.


    BT
    Yes I am going to have to do something like that, long springs aren't that easy to come by.

    Interesting point, the original knurls that I have came off an old, 40 years+, bump knurler. The wheels have a 1/4" inch bore, but the wheels are 10 mm thick and 20 mm diameter, within a tenth, according to the new mic the missus bought me.

    Strange, or just coincidence.
    Best Regards:
    BaronJ.

  7. #6
    Join Date
    Oct 2011
    Location
    Adelaide
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    Quote Originally Posted by BaronJ View Post
    I used the original hardened steel pins in the knurls and silver steel in the hinges.

    All the holes were drilled 6 mm initially because I did suspect that when I cut the slots the legs would pull slightly, which they did. So reaming them to size afterwards was the right thing to do. Though the pins were a good push fit, they would have to be pressed out if I needed to remove them.
    I had a "catastrophic knurling failure" on the weekend (everything seized up). Probably too high a speed but do remember to grease those pins occasionally.

    Michael

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