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  1. #316
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,942

    Thumbs up Dog Tooth Wrench !

    Hi Guys,

    I seem to be doing more bits on the grinding spindle than anything else ! I mentioned in the last post that I had got a bit of 3 mm plate. Well I've dug it out of the scrap box and it turns out to be an aircraft magneto adjusting spanner that I made quite some time ago that didn't fit properly. So I've spent some time today re purposing it.

    11-08-2020=001.jpg 11-08-2020=002.jpg

    Using a boring head in the mill I've opened out the bore to 30.5 mm diameter so that the end cap nuts will fit into it. I simply clamped it in the mill vise centered it up under the boring head and taken a 1.25 mm bite out of the ring. The grinding spindle end caps are a nice easy fit in the bore.

    11-08-2020=004.jpg 11-08-2020=003.JPG

    These pictures are of the bored out wrench before taking a hacksaw to it.

    Afterwards I took a hacksaw to the spanner and cut two of the three notches away, leaving me with a half moon shape with a single notch. Using the piece that I cut out I filed a tooth that would fit into the notch.

    11-08-2020=007.jpg 11-08-2020=008.jpg
    11-08-2020=005.JPG 11-08-2020=006.JPG
    These pictures are of the tooth that I made before silver soldering. I used a cooks torch to do this.

    I then silver soldered the tooth into the notch in the spanner, after which I filed the tooth so that it fit into the castellations in the end caps. A bit of deburring and cleaning up and I have my end cap wrench.

    11-08-2020=009.jpg 11-08-2020=011.jpg 11-08-2020=010.jpg

    These last pictures show the finished wrench.


    Thanks for looking Guys. More to come !
    Attached Images Attached Images
    Best Regards:
    Baron J.

  2. #317
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    53
    Posts
    1,115

    Default

    Nice work!

    Steve

  3. #318
    Join Date
    Sep 2009
    Location
    Sydney
    Posts
    370

    Default

    Agreed. Clever way to make a spanner Brooks TC Grinder.!

  4. #319
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,942

    Default Punch & Die !

    Hi Guys,

    Thank you for your nice comments, actually it was Steve who started the germ of an idea when he suggested a screw through the edge for the tooth.

    Anyway back to the plot ! I've started making a punch and die to cut the Teflon sheet in order to make the pre load washers to go on top of the grinding spindle bearings. The Teflon sheet is 5 thou thick and can easily be cut with scissors, but since the outside diameter needs to be the same as the bearings and the inside diameter needs to clear the shield, the washer will only be 2 mm wide.

    I had initially thought about turning them but couldn't figure out a way to do both the inside and outside that way, hence making a punch and die.


    12-08-2020-001.jpg 12-08-2020-003.jpg 12-08-2020-002.jpg

    I had the end from a hydraulic piston rod which was very conveniently 20 mm diameter, so taking 0.5 mm of the diameter was easy. I turned a 5 thou dish into the end so that I have an edge with which to cut the Teflon sheet.

    I also had a couple of pieces of 5 mm plate which I super glued together and drilled two 3 mm guide pin holes and two securing holes so that both plates can be clamped together with screws. These plates will form the 19 mm diameter die.

    This is as far as I've got today ! I still need to change the chuck on the lathe to the four jaw and set the plates up so that I can drill and bore the hole out to size. I can use the punch as a guide.

    I'll post more pictures later when I've progressed.

    Thanks Guys.
    Best Regards:
    Baron J.

  5. #320
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    267

    Default

    You've gone to a bit of trouble with that C spanner, looks like a precision fit.

  6. #321
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,942

    Thumbs up Punch & Die almost finished !

    Hi Guys,

    I've done some more on the punch and die. I changed the lathe chuck and put the four jaw on, I then set the work up so that I could drill a pilot hole in the pop mark which I then opened up with a 17 mm diameter blacksmiths drill. After which I bored out to 19 mm.

    13-08-2020-001.jpg

    Because there were two pieces of plate super glued together I used soft aluminium strips under the chuck jaws to clamp them. The idea being if the two pieces came apart then they couldn't escape from the chuck. There is no guarantee that both pieces are exactly the same size, so the soft aluminium will deform to accommodate any slight differences.

    13-08-2020-004.jpg

    This is a picture of the bored out two pieces still glued together with the punch inserted. The punch is a nice fit.
    I wont mention the slight error that I made.

    13-08-2020-002.JPG 13-08-2020-003.JPG

    Two more pictures of the parts before I split the two plates apart showing the punch inserted in the die.

    13-08-2020-010.JPG13-08-2020-011.jpg

    These two pictures show the guide pins locktited into the bottom plate of the die.

    At this point all that remains is to thread the two clamp screw holes M6 and test it with some Teflon sheet.


    Thanks for looking.
    Best Regards:
    Baron J.

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