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  1. #76
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default Dog Clutch.

    Hi guys,

    Well this is the second attempt to post my progress on the MK2 mill table drive. Here goes...

    Sorry ! :no::no::no: After waiting ten minutes to add some pictures, no go.

    I don't even know it this will get posted...
    Best Regards:
    Baron J.

  2. #77
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default Dog Clutch

    Hi Guys,

    Well another attempt to get some more pictures uploaded and added to the thread.

    04072014-01.jpg

    This is a picture of the mounting plate with a plug inserted as a dummy for the boss on the end of the mill table. The plastic plate is prevented from moving forward by the large headed screw on the left and the bridge where the control lever is attached on the right.

    04072014-04.jpg

    This screw was turned from a short length of 16 mm diameter silver steel bar. The shank is 10 mm diameter with an M6 threaded end. It screws into a tapped hole in the mounting plate with a nut and washer behind to provide extra security.

    12072014-008.jpg

    This is the business end of the dog clutch. The pins are 2.5 mm diameter by 6 mm long dropped into drilled holes and secured with a touch of super glue. The brass collar is soldered onto the brass tube. I machined the flats on the tube to provide locating pegs in the slot of the bridge piece.

    12072014-010.jpg

    This shows the bridge piece and how it locates the plastic plate.

    12072014-013.jpg

    Here I'm milling 2.5 mm wide slots in the bridge for the pins of the dog to locate in. This last slot looks a little rough ! For some reason the corner of the cutter chipped off. I cleaned it up with a file later. The bridge is secured by two M4 countersunk screws inserted from the back of the mounting plate.

    12072014-014.jpg 12072014-018.jpg 12072014-020.jpg

    These pictures show the dog clutch sleeve and the 1.5 mm slot cut through so that it can slide three millimetres backwards to release the dog pins from the bridge. The pin holding the spring is pressed into a 1.5 mm diameter hole drilled through the control lever. The spring ensures that the dog pins are securely held in the slots. The fingers on the right of the pin have been removed. They were already cut into the brass tube when I found it.

    12072014-021.jpg 12072014-029.jpg

    These two pictures show the components of the clutch and the fully assembled mechanism. The black plastic is a 30 mm length of acetyl that is drilled so that it fits over the 6 mm diameter control lever. I made the two arms out of 1 mm diameter spring steel. I heated the ends up and bent them so that I had 2.5 mm long ends bent at 90 degrees that would fit into the 1 mm holes drilled in the dog collar, the other end heated to red heat and quickly pressed into the plastic. I turned the end of the acetyl down to match the dog collar. The finger grip was simply carved with a wood gouge and sanded.

    12072014-031.jpg

    This is just a general picture of the fully assembled plate ready to be fitted onto the mill table. After removing the dummy spindle plug.

    All that remains is to assemble the wiper motor and to make the speed controller. Though for the time being I will use the variable voltage power supply.
    Best Regards:
    Baron J.

  3. #78
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Hi, just read this thread with great interest. It's amazing what can be made from recycled bits and pieces. Thank you for enlightening me on how you did this, looking forward to seeing the speed control unit.
    Kryn

  4. #79
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Quote Originally Posted by KBs PensNmore View Post
    Hi, just read this thread with great interest. It's amazing what can be made from recycled bits and pieces. Thank you for enlightening me on how you did this, looking forward to seeing the speed control unit.
    Kryn
    Hello Kryn,

    Thankyou for your kind words.

    One of the things that prompted me to go through the exercise of making a second version was that the first was a little slow, even pushing 30 volts through the motor, and that it was easy to call at the scrap yard and get another wiper motor. Part of what made the MK2 version more difficult was the motor and drive was the opposite hand to the original and also had a very much shorter output shaft. So to keep everything below table hight the motor had to be mounted from the front of the mill table rather than the back.

    As far as the speed control is concerned, I found a very nice 24 volt 4 amp transformer at the scrap yard and its this that I am going to press into service to provide the DC voltage for the speed controller. When I've got the thing properly sorted out I'll start a new thread for it. But just to whet your appetite the wiper motor takes just short of three amps stall current at 12 volts. Believe me it takes some stalling. I had to clamp the spindle in the vice to get a load reading.

    Anyway thank you for your interest. It makes writing it up worthwhile particularly if it helps someone.
    Best Regards:
    Baron J.

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