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| Swingup external threading tool |
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| andyf:
How about a thin metal shield, as C-o-C below, attached to the swinging part at points X, and covering the top and front of both the swinging and fixed parts? The top and front of the swingy bit would each need to stand slightly proud of the top and front of the fixed part, and swarf might still get in if the top of the shield had to be narrow so as not to foul the toolpost dovetail and any height adjuster on the fixed part. Andy |
| bogstandard:
Andy, That is the sort of idea I mentioned. At the moment, I have to get back into the shop and finish it off, and a shield will only be considered now after I see what is going to happen during the try out. I don't want things to get too clouded by 'maybe' problems. John |
| bogstandard:
I didn't manage to get into the shop until this evening, so I rushed thru everything, then took some piccy's of what I had made. The first thing was to get the holes drilled and tapped. I located the swing arm onto the little block and clamped it down onto the block top face, then the pivot position was drilled and threaded. The other holes were just for tool clamping screws and the height adjustment for the main block. A pair of phos bronze flanged bushes were made up and reamed 8mm. They had flange thicknesses that were in line with the gaps required and the position of the block. I also knocked up a stepped pivot bolt. I made the length so that when it was fully tightened down, the swing arm still had a few thou side to side play only at the pivot point, there was no rock at all at the cutter tip. If this play causes a problem, the bolt shoulders can easily be adjusted to snug things up a little. A bit of threaded rod and a height adjusting knob were easily knocked up. These are all the bits now assembled, and the tool completely finished. I had to fine tune the block a tiny bit as it was still a little tight, by removing a few tenths and a dab of oil on the block and pivot, the swing arm now easily rattles up and down, and no sign of side play at all. I'm very happy with the results and how well it went together. This is now set up for correct height on my machine. I just didn't have time tonight to get a trial done, and from very early tomorrow morning, I have personal things to do that will leave me incapacitated for a couple of days, so I am sorry, you will have to wait a little longer. I would like to do a vid of the results if they are satisfactory, unfortunately I don't have a camera mount for my machinery yet (another tuit), so you will have to take my word for it. Bogs. |
| andyf:
Looks terrific, Bogs :thumbup: It'll be interesting to see how well it works, once circumstances permit. Andy |
| mklotz:
I'm sorry, John, but I'm having an attack of the stupids here. It looks to me like the tool can only swing up only a tiny amount - a degree or two. Is that enough to clear a thread while you wind the carriage to the right? Do you swing it up with your finger - there doesn't seem to be a handle in sight? Do a befuddled colonial a favor and snap a few pics of it being retracted and/or provide a few words about how it's used in anger. BTW, it looks stunning. I wouldn't bother you with these questions but Santa is bringing me a QCTP and I'd love to make one of these assuming I can understand its operation. |
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