Was using my gear with the jointer in place and doing table saw operation and had both the set screws on the saw blade and on the jointer drive hub come loose. The jointer suddenly bogged down while making a cut and I found the saw blade arbor set screw loose. I did find nylok set screws on line but I will have to buy 100 pcs at $40 plus for a few screws. Does anyone have a source for these type of screws?
Bill V
set screw problem again
Moderator: admin
Re: set screw problem again
I just use blue loctite.
Re: set screw problem again
Gene
Blue loctite will work but on the sawblade arbors and the drill chuck the screw is continually removed and replaced. Don't know of blue loctite would survive continual loosening and tightening. I once made a locking set screw by drilling a hole through the screw body and forcing a piece of weed whacker string through the hole and cutting it flush. It seemed to work but I lost it when I sold an extra sanding disc to a friend. Guess I will have to make some more. This seems to be a bye product of the Power Pro speed regulation.
Bill V
Blue loctite will work but on the sawblade arbors and the drill chuck the screw is continually removed and replaced. Don't know of blue loctite would survive continual loosening and tightening. I once made a locking set screw by drilling a hole through the screw body and forcing a piece of weed whacker string through the hole and cutting it flush. It seemed to work but I lost it when I sold an extra sanding disc to a friend. Guess I will have to make some more. This seems to be a bye product of the Power Pro speed regulation.
Bill V
Re: set screw problem again
Loctite seems to hold up for me. None have failed to hold, yet. If a set screw ever does becomes loose, I'll just coat it again.
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JPG
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Re: set screw problem again
I think Dusty has a good habit! Replace em with new screws. 
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
╟JPG ╢
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Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
Re: set screw problem again
Time to upgrade to the stainless steel ones from rt bolts:
https://rtbolts.myshopify.com/collectio ... ools-other
https://rtbolts.myshopify.com/collectio ... ools-other
- rtbolts.jpg (44.36 KiB) Viewed 13907 times
RF GuyMark V 520 (Bought New '98) | 4" jointer | 6" beltsander | 12" planer | bandsaw | router table | speed reducer | univ. tool rest
Porter Cable 12" Compound Miter Saw | Rikon 8" Low Speed Bench Grinder w/CBN wheels | Jessem Clear-Cut TS™ Stock Guides
Festool (Emerald): DF 500 Q | RO 150 FEQ | OF 1400 EQ | TS 55 REQ | CT 26 E
DC3300 | Shopvac w/ClearVue CV06 Mini Cyclone | JDS AirTech 2000 | Sundstrom PAPR | Dylos DC1100 Pro particulate monitor
Re: set screw problem again
Regarding Bill V's suggestion that this may be a byproduct of Power Pro speed regulation, what is the theory? I'd like to get a PP at some point so I'm trying to understand what to expect. Is the thinking that it is pulsing power/torque to control speed and creating some kind of rotational jitter effect? Are there any other negative observations based on speed regulation?
Re: set screw problem again
DLB
That was the theory some time ago in a previous thread. When I first got my PP I heard a jingling noise like keys in my pocket and tracked the noise to loose hubs on the the left side of the headstock. I also found that the set screw that holds the pulley on the DVR motor shaft was also loose. After I tightened that screw and used the machine some more the set screw came loose again and fell into the motor pan and was almost lost in the sawdust. I used blue Loctite at that time. I don't think it came loose again but I have never checked it again.
It is my opinion that the pulsing of the motor speed is causing the screws to loosen. I don't know what the frequency is that the motor pulses at but I would think that the frequency would have to vary with the spindle speed. I will try to bring that thread forward again probably after the Holy Days.
Bill V
That was the theory some time ago in a previous thread. When I first got my PP I heard a jingling noise like keys in my pocket and tracked the noise to loose hubs on the the left side of the headstock. I also found that the set screw that holds the pulley on the DVR motor shaft was also loose. After I tightened that screw and used the machine some more the set screw came loose again and fell into the motor pan and was almost lost in the sawdust. I used blue Loctite at that time. I don't think it came loose again but I have never checked it again.
It is my opinion that the pulsing of the motor speed is causing the screws to loosen. I don't know what the frequency is that the motor pulses at but I would think that the frequency would have to vary with the spindle speed. I will try to bring that thread forward again probably after the Holy Days.
Bill V
Re: set screw problem again
Bill,wa2crk wrote:DLB
That was the theory some time ago in a previous thread. When I first got my PP I heard a jingling noise like keys in my pocket and tracked the noise to loose hubs on the the left side of the headstock. I also found that the set screw that holds the pulley on the DVR motor shaft was also loose. After I tightened that screw and used the machine some more the set screw came loose again and fell into the motor pan and was almost lost in the sawdust. I used blue Loctite at that time. I don't think it came loose again but I have never checked it again.
It is my opinion that the pulsing of the motor speed is causing the screws to loosen. I don't know what the frequency is that the motor pulses at but I would think that the frequency would have to vary with the spindle speed. I will try to bring that thread forward again probably after the Holy Days.
Bill V
Sorry, I forgot about this potential issue with the PowerPro. Yeah, I think I remember reading a thread a while back wondering about vibration issues from the PowerPro causing setscrews to come lose. The PowerPro is a switched reluctance motor as I understand it. I am no expert on them, but just doing a quick search, I found the article at the link below. They state that a switched reluctance motor "suffers from inherent vibration and acoustic noise". The former being the most likely cause for the setscrews coming lose as you mention. The latter most likely being the cause of the PowerPro noise that Shawn complained about in another thread recently. For the vibration, I am not sure that Shopsmith would have an answer, but I would expect that Striatech is at least aware of the issue and perhaps has a fix or suggestion. With proper engineering, it should be possible to calculate the vibration modes and natural frequencies of vibration of the PowerPro (as pointed out in this paper); and ideally minimize any of them that might induce setscrews or other hardware to come lose. It might be worth bugging Striatech regarding this issue, if Shopsmith won't address it. This has to be an annoying problem to have to deal with...
A Multi-Physics Modeling-Based Vibration Prediction Method for Switched Reluctance Motors
https://www.mdpi.com/2076-3417/9/21/4544/htm
RF GuyMark V 520 (Bought New '98) | 4" jointer | 6" beltsander | 12" planer | bandsaw | router table | speed reducer | univ. tool rest
Porter Cable 12" Compound Miter Saw | Rikon 8" Low Speed Bench Grinder w/CBN wheels | Jessem Clear-Cut TS™ Stock Guides
Festool (Emerald): DF 500 Q | RO 150 FEQ | OF 1400 EQ | TS 55 REQ | CT 26 E
DC3300 | Shopvac w/ClearVue CV06 Mini Cyclone | JDS AirTech 2000 | Sundstrom PAPR | Dylos DC1100 Pro particulate monitor
Re: set screw problem again
RFGuy
Just read the first part of the paper you referenced and I am convinced that the response time speed of the regulator to control the speed would need to be modified to slow the reaction time of the speed controller. I think that this would soften the impact of the rapid on/off switching and the resulting vibration. Much of the applications of the SRM motors are in machines that run at a relatively constant speed. An example would be a drill press. Once the drill bit is engaged in the stock, load variance is, I believe, at a minimum. Cutting many small pieces as I do for segmented turning would vary the load considerably. I am not as educated as you seem to be in electrical theory But I was wondering if SS would consider redesigning the coupler shaft to include a coil spring mounted axially inside the tube to absorb the rotational forces. Just a WAG. ( wild a$$ guess)
Bill V
Just read the first part of the paper you referenced and I am convinced that the response time speed of the regulator to control the speed would need to be modified to slow the reaction time of the speed controller. I think that this would soften the impact of the rapid on/off switching and the resulting vibration. Much of the applications of the SRM motors are in machines that run at a relatively constant speed. An example would be a drill press. Once the drill bit is engaged in the stock, load variance is, I believe, at a minimum. Cutting many small pieces as I do for segmented turning would vary the load considerably. I am not as educated as you seem to be in electrical theory But I was wondering if SS would consider redesigning the coupler shaft to include a coil spring mounted axially inside the tube to absorb the rotational forces. Just a WAG. ( wild a$$ guess)
Bill V