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Todays Project - What did you do today? - Printable Version

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RE: Todays Project - What did you do today? - PixMan - 04-12-2014

Finished up the screw for Darren by milling the 6mm wide x 20.25mm long keyway and putting in the 5mm hole called for on his print.

The keyway was a good exercise for me with the conversational Prototrak control on my Alliant milling machine. Because I don't have a 6mm end mill, I used a 4-flute solid carbide 13/64" (0,2031") end mill I had kicking around and used cutter diameter compensation to make it cut 6mm (.2362") wide. It took a couple of passes to get right, largely due to not having a reliable method of gauging the width. In the end I used the 6mm shank of a 1/8" solid carbide drill I have as my gauge, making that a very snug fit. I presume that a 6mm key will be on the small size, so it should fit with a tap in.

[Image: IMG_20140412_164821124_zpsxbj3myf3.jpg]

RE: Todays Project - What did you do today? - Hawkeye - 04-12-2014

The chuck that came on my dividing head was a nice 6 1/4" 3-jaw. Unfortunately, the size of it prevents a bolt from being used in the front slot when mounting the DH on the mill table. I have a 5" 4-jaw that has a backing plate with a hole just a bit smaller than the minor diameter needed for the M30 x 3 spindle thread. Easy to use a carbide boring bar to take it to the right size.

When it came time to cut the internal thread, I needed to make a split sleeve to mount my 1/2" boring bar with the threading bit. Cut a piece of 3/4" CRS, drill and ream to 1/2", slit on the horizontal mill - done deal.

Pretty standard threading job, after I had swapped out some gears to cut a metric thread.
[attachment=8111]

When the thread was 'visually' complete, I tried it out without removing the plate from the 4-jaw on the lathe. Since a 10 1/2" is a bit too heavy to spin off and screw onto a dividing head, I had to set the DH up to the hole on the lathe and crank it into the hole. It takes quite a while to crank in a 40:1 DH. I'm just glad it was already the right size. Nice snug fit.
[attachment=8112]

After the fit was proven, I cut a 1/4" deep section at major diameter. The backing plate tightens up very nicely on the DH spindle.
[attachment=8113]

The end result is that I can attach the DH to the mill table much more easily.
[attachment=8114]

RE: Todays Project - What did you do today? - Mayhem - 04-12-2014

Thanks Ken - I really appreciate your time and efforts in making this for me. I'll get you the height for the 5mm pin shortly.

RE: Todays Project - What did you do today? - Mayhem - 04-12-2014

Mike - nice work on the backing plate.

RE: Todays Project - What did you do today? - DaveH - 04-13-2014

That looks a job well done Mike Thumbsup
Smiley-eatdrink004
DaveH

RE: Todays Project - What did you do today? - PixMan - 04-13-2014

Mike, I envy you that tilting dividing head! Nice work indeed, getting it fitted with a good chuck.

I'm not actively looking for one of those, but I will eventually come across one and it would be on my "must have" list.

RE: Todays Project - What did you do today? - dallen - 04-13-2014

nice job on the backing plate, at 10.5 inches it would make my little 4 inch DH look like a toy.

RE: Todays Project - What did you do today? - Hawkeye - 04-13-2014

The 10 1/2" is the 4-jaw on the lathe. I was using it to hold the 5" backing plate for machining.

RE: Todays Project - What did you do today? - PixMan - 04-13-2014

Got some shop time today because it started off raining. With most of Darren's elevation screw & nut project done, I had to take some time to work on the motorcycle parts for Neil (expat.)

Two castellated nuts for axles I'd previously made. I got one completely done, the other still needs the slots put into it.

The turned, drilled, tapped and hex milled blanks:
[Image: IMG_20140413_165629184_zpsrm8txd2q.jpg]

The finished one:
[Image: IMG_2252-r_zpse5a0fdde.jpg]

RE: Todays Project - What did you do today? - TomG - 04-14-2014

Hey Ken, are you going to make the cotter pins for them as well? Big Grin

Nice job!

Tom