A little jiggy-jiggy

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Brass_Machine:
Hi Ade!

You got a good start going.

You are going to use the old boring bar to line the fixture up on the table?

Eric

Brass_Machine:

--- Quote from: AdeV on September 04, 2012, 05:56:48 PM ---It's new project time! :proj:

- The jig must be suitable for a MadModder Projectitus [shouldn't that be Projectitis? -ed] build log :scratch:

--- End quote ---

Fixed :smart:

AdeV:
Hi Eric,

Yep - the plan is to chop the boring bar up into segments, these will be bolted to the bottom of the plate and will fit into the slots on the machine. By having 2 on the Y-axis & 2 on the X-axis, it should be impossible to put the plate in the wrong place; and it should be repeatable to within a couple of thou, which will save me loads of time when putting a sump on or off the machine. When I was making the original, I must have spent a good couple of hours (overall) lining the thing up and edge-finding for the DRO - this jig should save all of that hassle.

AdeV:
So, a few days have passed... I turned the plate over on the mill, and clamped it up on some parallels, so I can now cut the outline shape of the plate out. At this point, a problem reared its head; the t-nut bolts are awfully close to the edge.... Rather than make the whole thing wider, I decided to make life hard for myself & cut an arc-shaped bit into the profile, so it widens out near the bolts.

Cue lots of :scratch: and more than one :coffee: ... I'd programmed everything up OK (I thought), but the machine moaned about a circle error... Eventually I discovered that MS Visio (which I've been using as a sort of CAD-lite) had mis-measured the arc, rounding up to the nearest millimetre. After a bit of :smart:, some more :scratch:, eventually I got the bugger to work...

First try: And another fine use for a Sharpie pen....

So, the next trick was to re-center the coordinates so the line was in the right place, then draw it again:

And, finally, as I wanted it to mill outside the shape, I turned on the radius compensation.... and it NEARLY got it right; I can't quite mill the plate full width where the tabs are, not enough space; so I come to a stop, lift the cutter, move the tab width across, down & carry on; but the radius compensation was trying to move the Y axis out of bounds.... After a lot more :scratch:, a bit of :hammer: some more :coffee: I finally managed to get it to go where I wanted... And here it is, doing cutting another 2mm or so:

It hasn't finished yet, another 5 mins and it will be done. Gotta love that...

AdeV:
Hmm, OK, 10 mins then, plus cleanup time (and more :coffee:)...

Next job, while it's still accurately located, is to mill slots for the guide pieces to fit in, and drill the holes for the dowel pins.

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