Setscrew in chuck to hold chuck on spindle?

[Leo Van Der Loo]

The attachment says that there are two setscrews provided with each accessory, but I've never seen an adapter that included setscrews. Maybe at one time they might have included the setscrews, but unless they are tightened down it would be a very bad idea to leave them loose in the adapter.

Where does it say that Bill (included setscrews) can you maybe show where ?) I have bought half a dozen Oneway chucks, the first one pretty well right after they started making/selling their chucks and sequently others over the years as I got some smaller lathes.

The only screws I have ever seen where the ones to fasten the adapter into the chuck, never set screws.

Yes if you have the setscrews, fasten them down well, something like how you should set the parking brake, where softly set people than drive with the brake on, and here loosen the chuck with the screws damaging the spindle because they forget they have the screws down some, where if good and tight they will (should) realize whats going on and not do any damage plus it will also do the job to keep the chuck from unwinding.

 

[Bill Boehme]

Where does it say that Bill (included setscrews) can you maybe show where ?

It seems pretty clear to me. Here is a crop from the image that you posted enlarged 200% to make it easier to read.



It says, "There are two set screws on all ONEWAY accessories that fit your lathe." That's not the same as tapped holes. It goes on to say, "... and then tighten the two set screws ..."

I don't recall ever using set screws in a scroll chuck or faceplate. Even if they did provide set screws, I remove them.

Maybe they ought to proofread their brochures and instruction sheets for accuracy. For years they have stated that their four inch cast iron faceplate has nine screw holes although it actually has eight holes. They correctly state the number of holes on all of their other faceplates.

 

[Leo Van Der Loo]

It does not say “provided” Bill, I assume it is another one of these dropped words “threaded holes” here, IMO, where we then can read it with the assumption that there are two set screws as part of these pieces, I know I have never seen any, or got any with my Oneway chucks or other pieces.

I have also read questions on different forums asking for the size of the set screws, and that’s where I discovered that the Shop-Smith had the inch size (¼”) thread in the adapter, as I used one and machined a larger opening in it.

Their machining is much better than their web site pages, and they are not the only ones that have that problem, it surely could stand some improvements, that’s for sure.

 

[Bill Boehme]

I'm glad that they finally got their new website going. It must have been at least a couple years where it was "under construction" and basically nothing worked right except for the home page. It seemed to me that their old website was working fine and I wondered why they didn't do the development of the new site off line. Even now, finding some items is still an interesting search because of the categories that they use. For example, The categories Chucks and Holding both feature a picture of a scroll chuck. A Gast vacuum pump is listed under the Chucks category while a screw chuck is in the Holding category.

ps: It's not as bad as the Craft Supplies web site.

 

[Jesse Tutterrow]

Perhaps the OP is referring to the approx. 1/8" diameter disc that is used between the bottom of the set screw and the metal threads of the spindle, and not a washer at the shoulder on the headstock. Nova chucks come with these little discs, which are designed to protect the threads from tightening the set screw as Gerald commented. They're very easy to overlook or lose and when I did so, I made a new one out of gasket material. (cut with a used .22 cartridge if I remember correctly) They are also supplied in a Nova chuck small parts kit that includes replacement jaw screws. (which also like to disappear)

Yes I was referring to the setscrew that secures the threaded adaptor to the lathe spindle. Here is a picture:
View media item 14677

 

[Bill Boehme]

You can also cut a piece of brass (example: brazing rod, or brass screw) and put it between the set screw and the spindle threads. It will grip, but won't damage the spindle threads.

-----odie-----

I think that could be an invitation to a problem when it's time to unscrew the chuck. Here is the scenario that I envision: you cut a couple pieces of brass rod about ⅜" long and slightly smaller in diameter than the threaded hole. You put the brass in the hole and then the cup tipped setscrew and snug it down. Works great until time to remove the chuck. You remove the setscrew and discover that the setscrew has mushroomed the end of the brass and it's stuck in the hole. Since the brass rod is in the recess behind the threaded part of the spindle there's not a good way to unscrew the chuck. Here's another scenario ... the brass isn't stuck in the screw hole, but it either cocks at an angle or perhaps falls out of the screw hole and wedges itself in place. How do I know about this? Well, while admitting no wrongdoing, I know of a woodturner whose initials are BB who used setscrews that were too short and they fell through the hole and jammed in place. Bad words were said. Somehow I ... er, I mean he managed to remove the chuck, but it wasn't pretty.

 

[Odie]

I think that could be an invitation to a problem when it's time to unscrew the chuck. Here is the scenario that I envision: you cut a couple pieces of brass rod about ⅜" long and slightly smaller in diameter than the threaded hole. You put the brass in the hole and then the cup tipped setscrew and snug it down. Works great until time to remove the chuck. You remove the setscrew and discover that the setscrew has mushroomed the end of the brass and it's stuck in the hole. Since the brass rod is in the recess behind the threaded part of the spindle there's not a good way to unscrew the chuck. Here's another scenario ... the brass isn't stuck in the screw hole, but it either cocks at an angle or perhaps falls out of the screw hole and wedges itself in place. How do I know about this? Well, while admitting no wrongdoing, I know of a woodturner whose initials are BB who used setscrews that were too short and they fell through the hole and jammed in place. Bad words were said. Somehow I ... er, I mean he managed to remove the chuck, but it wasn't pretty.

Interesting.......yes, I can see that happening, Bill. Good catch. I have used this method of using brass rod under the set screw where I worked. In that case the brass wasn't passing through a void before making contact. It worked well in that case, but it very well may not be the best method in all cases a turner may encounter. It may in some cases, but the turner would have to assess the possibility of encountering the scenario you describe, before attempting it.

The method I described is a temporary fix, and the most proper way is to use set screws where the brass tip is attached to the set screw itself, and I believe those are suggested elsewhere in this thread.

-----odie-----