Machining & Fitting 5C Collet Chuck to Logan 922 Lathe

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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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Опубликовано:

14 окт 2024

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Комментарии : 15

@tomherd4179 2 года назад

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.

@MaineMachinist 2 года назад

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.

@Pagweldfab 10 месяцев назад

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.

@MaineMachinist 10 месяцев назад

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.

@MaineMachinist 10 месяцев назад

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

@Pagweldfab 10 месяцев назад

@@MaineMachinist I appreciate your time in replying. It means a lot. Thanks!

@MaineMachinist 10 месяцев назад

@@Pagweldfab thanks for watching! Take care of that Logan they’re good machines!

@MyLilMule 2 года назад

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.

@MaineMachinist 2 года назад

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

@GnosisMan50 Год назад

Does 5C chucks have the same holding power as a 5C collect closer? I can't decide which one to get.

@MaineMachinist Год назад

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.

@dimsum5567 11 месяцев назад

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.

@MaineMachinist 11 месяцев назад

That’s not at all what the problem was here.

@MaineMachinist 11 месяцев назад

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.

@dimsum5567 11 месяцев назад

@@MaineMachinistaren’t you talking about it at 3:55 ?