Originally Posted by y0da900
Make sure you check a parting tool, the one that came with my QCTP is held up at a slight angle. As long as the largest tools your system can hold are where they need to be, there doesn't seem to be any need to make changes. If you upgrade from those brazed carbide tool bits, you might want to consider getting 1/4" or 3/8" tooling, which would improve your adjustment range a bit.
You can always shave it down if you run into a tool that is problematic, but it is rather difficult to put back if for some reason you ever wished it was there. I'd leave it until necessary to shave it.
Good call on the parting tool holder, I forgot to check that one because it didn't come with a blade. I have a couple on the way now, but it looks like it should work fine at this height.
I looked at indexable tooling, but ended up going with a set of the standard tools because it was cheaper for a wider variety of cutters. I don't do enough cutting that I am going to wear them out very quickly, which is where the indexable tools would come in handy; I am more likely to do a few of a wider variety of cuts, rather than a large number of the same cuts over and over.
Also, I went with the full 1/2" tools for the rigidity (they were also pretty much centered automatically in the stock tool post). Is there a particular benefit in downsizing to smaller tooling?
Originally Posted by cs900
Is this a post or wedge style QCTP? if it's a wedge you'll be fine, but if it's a post i would consider making a new riser plate that will put the majority of your tools on center with the post.
also, I really hope your not centering your tools off the tail stock unless your tail stock is perfectly on center at every point along it's travel.
It is a wedge type.
I usually center off the tail stock. I don't have any formal machinist training, I've picked up most of what I know online, and I've seen a few videos and guides that recommended doing it that way. I've also heard the method of facing a piece and adjusting tool height until the face is even. My question on that method, though, is what do you do for boring bars, parting tools, or any other cutter that is not intended for facing?
I've used my lathe for a couple parts now with my new QCTP. First is a custom shortened piston housing for a Tippmann A-5 Cyclone feed system:
The right is the stock aluminum housing, which I shortened for a custom modification (which I really need to get around to making a separate thread about), the center piece is the front section that I hacked off. I did this job years ago when pretty much my only tool was a Dremel; you can see my hack job of reproducing the groove. On the left is my new one cut from black Delrin.
I'm also working on a custom poppet valve, for ICD markers at the moment, though it could easily work for a variety of other poppet markers. I'm going with a ramped valve face, similar to the zenitram valve
. What tool do you recommend for an internal chamfer like that? This is the setup I used for now, though I could not get a very smooth surface finish from it:
I used the boring bar because I had to grind the face of the tool at a sharper angle, otherwise the lower edge of the tool would drag against the surface. Viewed from the top the tool bit is square across the front, and I came in perpendicularly to the angle of the chamfer. I needed the length of the tool to get the reach inside the valve body at that angle. Is there a better method than this?
Thank you guys for all your help and input.