Another new project... a QCTP (Quick Change Toolpost)

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jim:
another excellent write up!

i really am impressed with your work. ignorance is bliss, but also gets the job done!!

as we say at work, if it gets the job done its ok!

AdeV:

--- Quote from: jim on September 04, 2010, 04:05:39 PM ---another excellent write up!

i really am impressed with your work. ignorance is bliss, but also gets the job done!!

as we say at work, if it gets the job done its ok!

--- End quote ---

Thanks Jim, it's nice to know that my muddling along is appreciated :wave:

I have to say, my ongoing improvements are almost entirely down to the help & encouragement I receive on this site, so, in short: :nrocks: :mmr:

:thumbup:

Trion:
Your QCTP is beginning to look very good! :clap:

Regarding your issue when setting the shaft up in the v-blocks. Would it not be possible to set a DI / DTI to the tapered surface, run the X-axis back and forth and adjust the part until you got no dial movement? Just asking because I don't have such a fancy digital angle gauge.. yet ::)

madjackghengis:
Hi Ade, I keep a starret level on my mill table, it has two bubbles at right angles, and is pretty accurate matching up bubbles pretty close with my machine level, and I often use a level to get a piece in the vise close enough for regular kind of work, like putting a handle on a tool post. As to dimensions of a large tool block, I suggest you find one you feel is the right size, lay a couple of dowel pins in the female dovetail, use an appropriate sized adjustable parallel to tighten up the dowel pins (they need to be about two thirds the depth of the dovetail slot for accuracy), and measure off the parallel, and use the same pins and parallel when you make your slots. I'd suggest making a "master slot" blank, and use it for testing all your future tool holders, to keep from creeping larger or smaller, incrementally. By the way, you can braze a piece of high speed steel onto a bar of steel, and then grind it to a good shape and dimension for boring, and get a good boring tool, capable of good sized cuts, with little problems with chatter as long as your relief and clearance angles are good, and it sharpens up, right on the machine with a touch up stone, if you stone it every time you use it. I'm busy ignoring having "only" half a dozen tool holders, and changing out tools left and right. Maybe when I get my 12 inch shaper up and running, I'll make a gang of tool holders. :poke: :nrocks: Keep up the good work, Ade, mad jack

AdeV:

--- Quote from: Trion on September 05, 2010, 03:56:53 AM ---Your QCTP is beginning to look very good! :clap:

Regarding your issue when setting the shaft up in the v-blocks. Would it not be possible to set a DI / DTI to the tapered surface, run the X-axis back and forth and adjust the part until you got no dial movement? Just asking because I don't have such a fancy digital angle gauge.. yet ::)

--- End quote ---

Trion, thanks! If my lowly QCTP looks even slightly as good as your Sajo mill (once you've finished it), then I truly will be a happy bunny. As for using a DTI - yes, that would work just fine. It would probably take quite a while to get it spot on, although TBH I think you can get away with a whole chunk of inaccuracy because it's threaded, and slop in the threads will take up any error.

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