Does Your Chuck Unthread While Turning?
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- เผยแพร่เมื่อ 15 ต.ค. 2024
- I talk about the risks of running the lathe in reverse. And I explain how and why a chuck can unthread off the spindle while the lathe is running and how to keep it from happening.
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YES !!! , Many times I'm a slow learner LOL ... My chuck does not have a reversing screw . WHEN I remember when sanding I bring in the tail stock with soft tip ... Reverse sanding is awesome for highly figured grain .. Use this technique all the time ... Thank's for all your videos Awsome job Mike ...
Steve
St.Simons Island
Ugh should have proofread before sending 🙄 😒 😪 Hope
Thanks for sharing, Steve. I have never seen a wen chuck.
I rarely turn in reverse therefore I have not experienced the problem. But this video has made me aware of the potential problem and offered solutions. Thanks Mike. Your You Tube channel has been a great source of turning tips and techniques over the years I have been a subscriber. It has been both entertaining and educating. I look forward to more of the same in 2023. 🙂🙂
Thanks, Glen. Let us hope for a fun, safe year. My wife and I both caught covid but only a mild case.
Mike, Thanks so much for all you do to educate us, and for your service to our country. I wanted to recommend another TH-cam woodturner, search for mustardpiece.
He’s very creative.
Thank You, Mike! Looking forward to seeing more of your videos in the new year!
Lord willing and the creeks don't rise.
I tend to turn large bowls, yes it has happened to me frequently. I turn in reverse to sand just so the dust comes off the top and a fan behind me blows the dust out my garage door. Turning the speed down is a good tip. Thanks again Mike.
Thanks, Ken.
Great advice Mike. I have on occasion had my chuck start to unwind but was able to stop the lathe before it came off. The set screw for my chucks land squarely on the top of a thread so I am reluctant to use it.
That is unfortunate. Most spindles have an unthreaded area near the shoulder. I suppose you could remove the last couple of spindle threads with a HSS scraper.
Thanks for addressing this issue, Mike. Like you, I've encountered this scary and potentially hazardous problem when abruoptly turning off my Robust (VFD drive) lathe. The momentum of a 24" platter or 25lb chunk of green wood can easily unravel from the spindle. I learned very quickly to gradually reduce the speed before turning it off with larger pieces.
I do not turn many big pieces so it took me a while to encounter this. I think I will mention in a longer safety video.
I was stupid the other day and after shutting the lathe off the heavy chuck spun off and i grabbed and put a burn on my hand. Thanks for the tip of shutting down my freq drive first.
Sometimes I learn things the hard way, too!
Happy new year Mike! God’s blessings on you and your family for this next year! Thank you for sharing your time with us. Absolutely love the video content each and every time.
Thanks, Wilson. I appreciate your support.
Thanks Mike. I’ve not had a Chuck unmount itself during reverse sanding, reverse cutting (normally very light cuts and minimal material removal) nor with stopping the lathe (even with my large chucks and fairly large blanks). I have a Robust American Beauty with a couple of fairly large chucks (Vicmarc VM120 and Axminster Evolution SK114) and I use one of the thin plastic washers. I guess I’ve been lucky, ut so far no problems and I have not used the grub screws to keep the chucks in place. Thanks for the video. Hope you have a great New Year. Cheers, Tom
Sometimes we make our luck. Happy New Year to you, Tom.
Hi Mike, Happy New Year. An interesting topic. I have a Robust American Beauty and have had the chuck loosen up during reverse sanding. When I started turning my mentor showed me the wrist flick method for installing the chuck and I always use it. I have several Super Nova 2 chucks and if I have very much sanding to do in reverse I use the grub screw and it sets just to the rear of the 1-1/4 x 8 threads. If I have just a little reverse sanding I'm careful to keep a close eye on the chuck for coming loose so I don't have to mess with the grub screw. However, normally when I put a chuck on my lathe I just install the grub screw so I don't forget it later unless I know I will not be doing reverse sanding and will be taking it off shortly for another procedure etc. I must admit I was very surprised the first time it happened and quickly learned my lesson...better safe than sorry I guess. I have a 4" magnetic dish from Harbor Freight on the head stock with grub screws and an Allen wrench so they are readily available to grab. I bought a few extras so when I drop one in the chips I don't have to spend an hour looking for it...
Take Care,
Myles
Based on all of the feedback I got, I will start recommending the wrist flick method. An occasional stuck chuck is preferable to one unwinding.✌️
@@MikePeaceWoodturning Hi Mike, OK, but as I said in my comments was that I have ALWAYS used the wrist flick method and still have had chucks unthread. I bought a 1-1/2" wrench which fits the standard Nova insert to remove the chuck and it saves a lots of body jerking with a chuck key. I will continue to use the grub screw to avoid damage to my lathe or my legs and feet if the chuck should come off. I agree it's a pain to have to thread in the little grub screw but safety first for me. Take Care, Myles
Happy New Year Mike! The only time I've had a chuck unwind on me is when using an adapter or insert.
I have not seen a spindle adapter with a set screw. You ma have to drill and tap.
My first lathe was a Delta midi ( 1" x 8 TPI ) and the first chuck I bought for it was a Nova G3 with adapter. The adapter did not have a spindle set screw and I did have it come loose ( not right off but close ) while sanding in reverse several times. That made me stop sanding in reverse.
I have since moved up to a full size lathe and bought two Super Nova 2 chucks and a new adapter for the G3. All have the set screws and I use them all the time. No issues since I made that change.
Interestin. I did not realize that Teknatool had an insert that did not have a set screw. Record Power had two different inserts, one with and one without but they discontinued the one without a set screw.
@@MikePeaceWoodturning To be up front I was a brand new turner when I bought the chuck. Best price was on Ebay from some re-seller. It's entirely possible that the adapter they included was not an OEM Nova product.
I don't sand in reverse a lot but I do change chucks frequently, so I don't like using the set screws to lock the chuck. I tend to use the wrist flick method because it works well enough while still being easy to remove the chuck.
Thanks for sharing. All viewers gain from shared experiences.
In my experience putting on the chuck with a flick of the wrist isn't enough. I replaced the little plate spindle wrenches that came with the machine and replaced them with some real wrenches. Tighten the chuck with a quick flex and they don't come loose. I'm not worried about hurting the equipment. I used to work as a manual shaper operator and I had to put a full body flex on those because you don't ever want that stuff to come loose. Never damaged the parts at all.
I like your idea of getting a good wrench. I need a better one.
I have had it come unscrewed while sanding in reverse. I was powersanding with a drill, also in reverse, and the sandpaper disc went out of position and rubbed the inside of the bowl a bit like a catch. The Chuck was on an adapter from 1 1/4 to 1 inch as it was a smaller church and the adapter did not have a set screw. That is where it came loose. Fortunately, I saw it happening and quickly shut down the lathe before it had a a chance to come completely off. I subsequently drilled and tapped the adapter to accept a set screw so it won’t happen again. I have two lathes with different size headstocks, so have adapters both ways so I can use chucks on both.
Good point about many adapters not having a set screw. Mine does not.
Mike, I’m like you and rarely turn in reverse. However one time I was using a small PSI Baracuda chuck and apparently had not tightened it when mounting it, and while I was roughing a small spindle blank, I noticed excess vibration, and found that the chuck was backing away from the headstock. Now I will “pop” mount this chuck as it does not have the grub screw as my Nova chucks have.
I have a chuck that tends to loose easily and one that tends to lock tight. I guess we all have different variables that can affect our view of what is safe. Thanks for sharing.
Hello Mike, very useful video! I have a midi lathe and the two small chucks (2 1/2 and 4 inches) it has are without set screws, unfortunately. I actually bought a bigger chuck first that had a collar on its back with 3 worm screws, but I had to replace it, because I felt it was too big (8 pounds) for my midi lathe. Basically I was worried about the spindle bearings. I have watched your video and now I'm worried about the chucks coming off.😟 Luckily it hasn't happened so far, probably because of the relatively small size of the chucks I have, and the small size of my projects. How could I prevent the chuck coming loose if I reverse the machine? I frequently use the reverse setting because I'm left handed, and often it's more convenient to work from the other side of the lathe. I'm planning to turn some larger dishes and this might be an issue in the future. I wouldn't like to buy another chuck, because the ones I have are just the right size for my lathe. I should have bought some chucks of a different brand probably, but then, other makers' smaller models seem to lack the extended collar with the worm screws, too.
Give the chuck a good wrist snap so it will seat strongly. Your best bet is probably a chuck with a set screw.
Do you have a screw loose? I watched your video a while back on this topic and I have always used the set/grub screw as habit if using reverse or not - having a reverse feature is great as my first lathe did not have that feature or variable speeds.
Certainly a safe habit.
How big of a difference does a better chuck. My first one showed up today. It is a cheaper one only 90 bucks I think and I've had wood fly out of it twice
Wood can fly out of any chuck if the chucking method is incorrect. That said, you do get what you pay for and quality costs more.
It happened to me today with the motor brake, luckily I’d turned sideways to resharpen for a final cut , then reset the rest gave it a spin with the handwheel and it clunked ! I don’t think that burl bowl would have survived with that flywheel attached had it come right off but was only 2revolutions .
Nice to get an awareness of the risk early without pain or damage.
I had a large bowl come unscrewed on me once and had the tailstock in place. How it unscrewed is beyond me, but when it did, it galled the spindle threads and also the threads in my chuck. Since then, enen though it might be a pain to do, I've used the set screw to hold the chuck in place.
Never thought about galling.
I occasionally reverse my lathe for sanding, but I have never had a spindle 'unwind' when doing that. As you say, if you are sanding properly, you won't be applying enough force (torque) to break that connection.
My experience regarding a chuck coming loose when stopping the lathe is the same as yours, and I've also learned to slow the lathe down before stopping it.
The only thing I would add is that this phenomenon might also be a good reason for wearing steel-toed safety shoes in the shop. DAMHIKT
Ouch! I find myself being more safety concious the more I learn.
It has happened to me when shutting down too fast when in reverse mode. I have learned a lesson or two.
It is a wakeup call, isn't it?
Mike can you review for us your fixture on the lathe that connects to your dust collection system. I need to make one.
I have a video on this in my woodturning Tips video. Go to my channel home Page and do a search on dust collecto hold. I am traveling and can not figure out how to copy the URL to put in this reply using my phone.
First time I’ve seen “1 view, posted 19 seconds ago” 😀
Someone has to be first, right?
Mike -- The only time I've had a chuck unthread was related to sanding in reverse -- kinda. When finish sanding one project, I put the lathe into reverse for the last grit. Then, I took the item out of the chuck. Cleaned up my shop and turned out the lights. I didn't return to the shop for a few weeks, this time to finish a large hollow-form I had rough-turned a year or so before. I mounted the blank onto the lathe using a faceplate. I didn't use tailstock support because I'd planned on finishing the hollowing before working on the exterior. When I started up the lathe, I noticed the entire hollow form started to shift -- very smoothly -- to the right. I tried to clean up the mouth of the opening in the hollow form with a spindle gouge, but I couldn't get a cut. I tried sharpening my gouge. It still wouldn't cut. I tried several other tools, including some carbide tools. I couldn't get anything more than a little dust! I thought I'd forgotten how to turn. I was about to give up in disgust, when I noticed that the lathe was still set to run in reverse. That's when I also noticed that the blank had backed off the spindle about 1/2 inch.
Someday I may learn to laugh at that incident.
That made me laugh. I did something similar when I replace a blade backwards on my table saw. My son used it while I was gone leaving some Störche mdf scraps behind. Took me a while to figure out what had happened.