HOW TO MAKE A STAINLEES STEEL MYFORD DRAW-BAR TO STOP THE CHUCK UNSCREWING
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- Опубликовано: 19 июн 2023
- See how to make a simple stainless steel 10MM draw bar for your Myford Lathe. This failsafe draw bar can be used for all types of reverse spindle rotation machining to stop the chucks from unscrewing. They are particularly good for safe and easy screw-cutting away from the headstock as you do not need fast reactions like you need if screw-cutting towards the chuck. This setup is also good for using upside-down part off tools on the front tool-post, which makes parting off easier than a normal part off setup.
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Nice work yet again. We shared this video on our homemade tools forum this week 😎
Excellent..... Regards Steve
Great idea this Steve, I particularly like the idea of thread cutting away from the chuck. Thanks for sharing
Can't thank you enough for putting this one out Steve. 👍
Hi John, Thanks. I'm pleased you like it. Regards Steve
Thanks for making this video. It's a well thought out solution and I'll be making one for my Super 7.
Hi David, Thanks. I'm pleased you like it and that you will make one for your super7. Regards Steve
Nice work Steve, cheers
Great bit of kit Steve nice one
Thanks 👍
The front spindle bearing on a Myford was/is a plain oil fed conical one (originally hand scraped!). It was really designed to take high loads applied towards the headstock and is very capable of this - I recollect seeing seven ton loads being quoted as acceptable. Now, thread cutting loads are fairly low and should be handled by the pair of angular contact bearings at the rear of the spindle so I don't think there is a problem with running the spindle in reverse for thread cutting.
Thanks Steve this Helped a lot!
That's great. Regards Steve
Thanks for sharing. I have a South Bend 9, and wondered how to machine in reverse without the chuck coming off, for threading. I muchly prefer threading away from the chuck instead of toward the chuck. You can of course just turn the last few threads by hand when going towards the chuck, but where's the fun in that.
Hi, Thanks. Yes I have even done threads using a manual spindle handle. But I was most impressed when I saw someone cutting the threads at speed away from the headstock. Regards Steve
Awesome!!! Thanks this is going to help me !!
Great idea Another tooling project
Hi, Thanks for watching. I'm pleased you like it. Regards Steve
This accessory is super useful and easily made. It can even be made cheaper if one does not use an all-thread bar.
However, with this, one cannot insert a long bar through the chuck into the spindle for turning.
Wondering if you have ever tried to use a compression ring on the chuck's back plate part that screws onto the spindle? I am talking about the method used on Schaublin 70 and 102 lathes. The Schaublin compression ring prevents the chuck from unscrewing.
Thanks!
Daniel
That's such a great idea Steve. The chuck I use most of the time is a 4 inch, and I don't have a 5 inch chuck. I wonder if there's any way to lock the 4" in place? I like your inventive videos Steve. Cheers Nobby
Hi, Thanks. Yes, it can be done on the 4 inch chucks, but it requires a slightly different and fairly straightforward method. I may show it soon as I like using the 4 inch chucks as well. Regards Steve
@@SteveJordan That's good news Steve. I look forward to seeing how you do it. I've not used the Myford in reverse yet, but have plans to try screw cutting in the future. Cheers Nobby
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Excellent job. Did you consider putting a taper on the brazed end to help center it in the back plate? Also, do you expect the drawbar to put any extra pressure on the spindle bearings?
Hi. It doesn't need a taper for centering as the brazed end is a very close fit in the chuck bore. Therefore, it's on centre when it is pushed into the chuck, which is permanently fitted to the backplate when in use. There isn't any extra load on the bearings using this draw bar as it doesn't weigh much. Regards Steve
Now make it make sense to me, I forgot your chuck is screwed on the lathe 🙄. Good job.
Hi Yes, It's one of the things I don't like about the Myford lathes.