Hi Guys,
Some time ago, TH62 started a thread on drill grinding jigs. http://ift.tt/1oj8LEM
I must admit I became very interested and did a concept drawing of my ideas based on TH62's work. Having spent some time mulling it over and not doing much about it, I've bit the bullet and acquired some 3 mm steel plate and a bit of 1" x 1" x 1/8" angle iron.
Drill_jig.jpg
I've cut out the side plates and base plate based on the drawing that I did. I clamped the two sides together marked out and drilled the locating dowel holes through the plates. Using a couple of lumps of 1/2" thick brass blocks machined the same width as the base plate, a couple of lengths of rod to go through the dowel holes, I clamped it all together using dots of super glue to secure everything.
The lengths of rod and the brass blocks enabled me to ensure that the assembly was accurately lined up and square. I then stitch welded the bottom plate to the side plates and the small top plate. I cut the angle iron to the correct length and by drilling a 6 mm hole 10 mm away from each end was able to clamp and stitch weld the angle iron to the bottom plate. I used the brass blocks to ensure that the angle iron was square and shims to make sure that it was centered in the assembly.
I used a broken 1/8" shank carbide drill bit as a scribe to test that I had got the V of the angle iron placed exactly in the center height of the jig. I've still got some work to do making the mechanism for clamping and setting the drill length.
Drill-Jig-2.jpg Drill-Jig-3.jpg Drill-Jig-4.jpg
The third picture shows the two round stitches holding the angle iron in the bottom of the jig.
Note that the jig is intended to be used layed on its side as in the first picture.
Drill-Jig-5.jpg Drill-Jig-6.jpg
The pictures show how far I've got at the moment, I'll post more as I progress.
Some time ago, TH62 started a thread on drill grinding jigs. http://ift.tt/1oj8LEM
I must admit I became very interested and did a concept drawing of my ideas based on TH62's work. Having spent some time mulling it over and not doing much about it, I've bit the bullet and acquired some 3 mm steel plate and a bit of 1" x 1" x 1/8" angle iron.
Drill_jig.jpg
I've cut out the side plates and base plate based on the drawing that I did. I clamped the two sides together marked out and drilled the locating dowel holes through the plates. Using a couple of lumps of 1/2" thick brass blocks machined the same width as the base plate, a couple of lengths of rod to go through the dowel holes, I clamped it all together using dots of super glue to secure everything.
The lengths of rod and the brass blocks enabled me to ensure that the assembly was accurately lined up and square. I then stitch welded the bottom plate to the side plates and the small top plate. I cut the angle iron to the correct length and by drilling a 6 mm hole 10 mm away from each end was able to clamp and stitch weld the angle iron to the bottom plate. I used the brass blocks to ensure that the angle iron was square and shims to make sure that it was centered in the assembly.
I used a broken 1/8" shank carbide drill bit as a scribe to test that I had got the V of the angle iron placed exactly in the center height of the jig. I've still got some work to do making the mechanism for clamping and setting the drill length.
Drill-Jig-2.jpg Drill-Jig-3.jpg Drill-Jig-4.jpg
The third picture shows the two round stitches holding the angle iron in the bottom of the jig.
Note that the jig is intended to be used layed on its side as in the first picture.
Drill-Jig-5.jpg Drill-Jig-6.jpg
The pictures show how far I've got at the moment, I'll post more as I progress.
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