Steve, Don,
Thankyou guys for looking in, and the compliments.
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Now it's time to machine a set screw
which will go here
as like this, preparing the moveable jaw for the setscrew
and now the set setscrew, made from aluminum round rod
make a screwdriver slot
mini hacksaw it off
and put it in it's place on the moveable jaw.
now the stabilizing bar
and on the model
Now to make the leadscrew
my leadscrew will be 5/16-18 so need to secure the body dimensions from a cap screw of thast size.
now take all the leadscrew dimensions from the original
And the fabrication begins
check for threaded fit, with the model itself.
now to make the relief at the end of the leadscrew that goes into the moveable jaw at this area
and on the model
get all the dimensions needed from the model workpiece, such as hole depth
transfer it to the leadscrew
and machine it to size
check for sliding fit
now to locate where the setscrew will be located on the leadscrew
theres the mark left by the setscrew bearing down on it here
now I need to cut a recess in this area for the setscrew to float inside of it
now to check to make sure the slot (recess is deep enough to allow the setscrew to penetrate the empty space far enough
here are both ppieces ready for assembly
now to make the handle for the leadscrew,
I need to drill and tap a threaded hole on one end to allow a cap to be put on after the handle is in place on the leadscrew.
cut to final length of the handle before second endcap is put on.
now the endcap is made
temp. put together
now to locate and drill a hole in the leadscrew to recieve the handle subassembly.
Now I turn my attention to machining the softjaws,
I need to fabricate 4 cap screws like the original shown here, these hold the softjaws on the hard jaws,
but first I need to drill the thru holes in the hardjaws on the model, so I'll center each hole in between the recesses cutout on the moveable jaw first,
with everything set up and located I can drill the body diameter holes first for 4-40 screws
Now I need to counterbore for the capscrews , I don't want to use an endmill, it may grab the workpiece, in my drillpress, so I opted, to use a dremel round profile burr, as shown here
it did a nice job of cutting very smoothly a CB.
Now when I made those last two holes, I used the recesses machined in the workpiece to center the holes, however, on the front jaw, there is one continuous recess machined throughout, therefor, I need to use the center of the inside recess as the reference point to work off of, but first I need to transfer the distance each hole is off center of the moveable jaw here,
to make these holes line up with the fixed jaw over here,
now the hole model top assembly containing the fixed jaw, is setup in the drillpress, for hole locations
and now the drilling process is underway
Next will be the making and assembly of the softjaws on the model, and do some final finishing work and it will be a completed model.
I will then post a picture of it in the next post, with a short video clip of it, being put through it's mechnaical movements.
Thanks for looking in.
Have a great day..