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| BillTodd:
Where are you Richard? I have a Wolhaupter UPA1 that, with an adapter or three, could fit in there. Bill |
| RichardShute:
Hello Bill, thanks for the offer, I'm the other side of the river from you in Kent, but I do sometimes get a visa and venture as far as SX. I'll certainly bear it in mind, but I would like to come up with a solution that would allow me to use my boring head in future anyway as I can see it is something I might reasonalbly want to do on some occasion, I am rather surprised I can't. After a quick measure up, I notice that the shank on the boring head is a somewhat short example compared to say the collet chuck, which actually gives me a bit more space to make a male-female thread extension piece and it looks like the shim tube sleeve is a viable possibility. It will be marginally less rigid, but in the overall scheme of things it's a small price to pay if it works. Is an overhung MT4 stiffer than a fully seated MT3? 1st year structural analysis problem, but I can't be bothered to worry about it. Josh, glad you are not bored to tears. I nearly did give up, but there's not much to be learned from that and after some thought, the final product will probably still be 'useful' even if not as elegant as I had intended. Workshops are full of inelegant chunks of recovered mistakes that are battered through use because they are nevertheless useful - well, mine is anyway....... Richard |
| RichardShute:
So I have finally got round to whittling a little more of this beleaguered project. Following on from my earlier problem that the boring head could not seat into the taper in the horizontal spindle, I started by making an extension to the shank so that the drawbar had something firmer than fresh air to engage into with a sleeve of shim round the shank. There was already a transverse hole in the boring head shank so I used that to accommodate a cross pin to ensure the extension does not unscrew from the shank rather than the drawbar from the extension. It would have been a major PITA, trying to grab that down the bottom of a MT bore. Just for an initial test I used a couple of bits of scrap 'tin' as shims, but later rolled up a decent full length tapered sleeve from proper hard shim. It took a couple of goes to get the length quite right - I had deliberately made it a bit too long, but the result worked well. The boring head seated firmly and with enough clearance that I know it was seating properly on the taper and not against the shoulder. So finally, bolt the bearing bracket loosely back onto the angle plate and the angle plate to the table. Then slacken the bracket to angle plate bolts while I tightened the gibb locks to make sure nothing was stressed. And finally properly tighten the clamp bolts again. Once I'd released the overarm taper-gibb lock, I was ready to start. Et voila! Twenty minutes later, a bigger hole in the place where I wanted it, shame the metal round the hole is a little misplaced, but I'll just have to live with that. It is not actually as close to the top web as it looks, bit of an optical illusion or shadow effect. After removing the angle plate, it's more as it will be in use. All I need to do now is make up a bush and the job's done. I had a thought looking excessively thick iron below the bore and it occured to me that using a Woodruff cutter I could make a bit of a void in that area to act as an oil resevoir for the bearing and add a felt wiper to the bush to ensure the sliding surface is always nicely oiled. A small redemption for my earlier mistake or taking advantage of adversity if you're of a more optimistic outlook - it might even look like it was meant to be like that. Richard |
| RichardShute:
As you can see, I did put an oil pocket in the bottom of the bore and also a wick in the bush. Here is the finished item. And yes, I did clean off the stray paint after I'd given it a second coat. It is good enough to use even if not as elegant as I had intended, pretty much the story of my life.... Richard |
| Stilldrillin:
Very nicely worked through/ done Richard..... :clap: :clap: Well shown too! :thumbup: David D |
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