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| A thing..... |
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| bogstandard:
I think you will find that there is a reason for having two lock on faces for a modern toolpost. As previously mentioned, the dovetails are usually 60 degree, that is to give more surface area for clamping and so aid rigidity. Now to the two sides. Having a single sided holder and swinging it about is harking back to the days of lantern toolposts and HSS or carbon ground up tooling. This is where the tool tip is swung about until the angles and height look correct and the tool is used like that. The modern way of tooling use is the tipped variety, and they really do rely on being set at the correct angle to the job for them to cut efficiently. Thousands of design hours have gone into doing just that. So the toolpost is set to 90 degs for one face and parallel to the workpiece on the other, then locked up solid. I find that using this criteria for ground tooling works just as well, and only requires the toolpost moving on very rare occasions, just to give me a bit of deep cutting clearance. Look at almost any good tipped tooling set, and you will see they have shaped holders. When those are mounted into a squared toolpost, the tips of the tool are at the correct cutting angles to the job, and should be left that way. Bogs |
| NickG:
Good point John, I always use HSS and am always swinging the tool post about. Even a 4 way post is far better than the single one I have - it's awful! |
| raynerd:
Hi John, that is interesting and makes sense to me. I`m forever swinging the tool post around to gain a better cutting angle for my HSS tools. I think perhaps much of it is lack of experience but I can certainly see when I have it set at a better angle, just trial and error and I see it cuts better. I`ve not got any indexable or "expensive" tooling but can see how these are set to the correct angle to be mounted in one of the faces of a two face QCTP with the post set square to the work. I guess after reading that, for now I`m going to have to continue to swing the tooling around as I don`t know how to mount or grind my tooling correctly so as to set it up in a modern two face QCTP. I suppose there will be little benefit of having two faces as I have already admitted that I will probably have to continue to swing it occasionally anyway, so I guess swinging it horizontal to the work is little extra effort. That being said a single faced QCTP will still be much quicker and more effecient so this project is still all go.... Darren - if you don`t mind me posting here then I will do! I`ll get some picks up tonight - :thumbup: Chris |
| Brass_Machine:
Don't know how I missed this. Looks good Darren. You did a fantastic job! Eric |
| Darren:
Wow Eric, where you been :lol: Thanks for the comments, the fact that I'm still using it and it's the only tool post used on my main lathe must mean it worked :ddb: In fact I was lathing something up earlier this evening.... :dremel: |
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