Machining & Fitting 5C Collet Chuck to Logan 922 Lathe
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- Опубликовано: 14 окт 2024
- This video shows the complete explanation and process for how I chose to finish the backing plate and mount the 5C Collet Chuck to a vintage Logan 922 Lathe.
The project ended with LESS than .0005 runout at the 5C Collet taper, which is better than Bostar advertised for the chuck. They claimed .0008.
I explain why and how I modified the semi finished adaptor plate to ensure better accuracy.
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I liked the care you took in planning how to do the job. One thing I was concerned about is what if the threads were perpendicular to the face, then the 2 thousands off on the rear really would not matter, except for appearance, and the fact that you wanted more thread engagement - good idea.
I see what you’re saying about the threads.
I figure I wanted the “rear” of the plate as parallel as possible to the face of the plate that the collet chuck mounts to since the rear buts up against the shoulder on the spindle.
I think by mounting it on the lathe first, facing the part and then machining the back parallel to it will make sure everything stays square to the threads, and as you mentioned it also gains the extra thread engagement.
What's your opinion on how far the chuck sticks out as opposed to the factory collet closer? I'm in the same boat on my Logan 920 (11") and am contemplating going the same route you did. I enjoy your videos and explanations throughout. Very thought out.
I haven’t experienced any issue with it since doing this video. I was also concerned about the overhang, but the spindle bearings are strong. Imagine if you chucked up a large piece of material, say a 7” piece of round stock. That would be a lot more weight on the spindle, and yes, you’d probably have it supported with a tailstock, but maybe not. Maybe it’s 7” diameter and only 7” long, then it would be only in the chuck jaws.
So I don’t see any issue with it at this point.
I will say it’s been very convenient to use and helped me take several jobs at my shop I wouldn’t have otherwise brought in
@@MaineMachinist I appreciate your time in replying. It means a lot. Thanks!
@@Pagweldfab thanks for watching! Take care of that Logan they’re good machines!
I've been thinking about getting one of these for my Southbend. But I am leaning a little more toward an ER40 tru-set chuck.
In the end that may be a better option. I chose 5C just to consolidate what I had for tooling with my other larger lathe
Does 5C chucks have the same holding power as a 5C collect closer? I can't decide which one to get.
If your lathe can accept a factory collet closer, they are by far superior to this style.
My larger lathe has a collet closer and it holds things more securely.
This lathe has the early Logan spindle which is hard to get parts for. That’s why I did the collet chuck on this one.
So what was the point of all this? Just to increase thread engagement? I thought the primary concern was that the id of the shoulder was too big for the of of the lathe spindle shoulder… The way I solved it is I bored it even more, then press fit the bronze bushing there that slip fits on the spindle shoulder… a lot of work though.
That’s not at all what the problem was here.
The video explains in detail what was wrong and how the Logan proprietary spindle requires modification of the collet chuck. It wasn’t too big.
@@MaineMachinistaren’t you talking about it at 3:55 ?