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Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 4:57 pm
by edma194
I agree with Tom on this subject. I guess I never saw it written down anywhere to leave some space for the spring to compress but I had some prior familiarity with elastomeric couplings and assumed it was necessary. The vibration feedback through the coupler can be a problem when there's a stiff connection between the hubs. The material is strong enough to withstand it though, along with any withstanding flexing necessary to account for misalignment of the hubs.

Since there aren't widespread reports of couplers breaking and I'm sure plenty of people who jam those things in as tight as possible then in the end it doesn't seem to matter much. Those couplers are tough.

Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 5:14 pm
by Chad
I posted this on the Shopsmith woodworkers welcome group on facebook: "It's a interesting notion. It would defiantly keep the spring from being completely collapsed, and not loosing full rebound over time."

Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 5:35 pm
by jsburger
Chad wrote: Sat Mar 26, 2022 5:14 pm I posted this on the Shopsmith woodworkers welcome group on facebook: "It's a interesting notion. It would defiantly keep the spring from being completely collapsed, and not loosing full rebound over time."
The inside end of the spring is recessed inside the shaft of the coupler at least 1/2". Even if the hub is bottomed in the coupler the spring is only compressed about half way.

Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 5:46 pm
by Chad
Thanks, John.


Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 5:48 pm
by jsburger
edma194 wrote: Sat Mar 26, 2022 4:57 pm I agree with Tom on this subject. I guess I never saw it written down anywhere to leave some space for the spring to compress but I had some prior familiarity with elastomeric couplings and assumed it was necessary. The vibration feedback through the coupler can be a problem when there's a stiff connection between the hubs. The material is strong enough to withstand it though, along with any withstanding flexing necessary to account for misalignment of the hubs.

Since there aren't widespread reports of couplers breaking and I'm sure plenty of people who jam those things in as tight as possible then in the end it doesn't seem to matter much. Those couplers are tough.
Tom is certainly entitled to his opinion and he clearly stated it was his opinion in the video.

However, I found it interesting he used his power station instead of his MK V to make his point. He clearly needs to adjust the lock on his power station. Mine is not overly tight to lock and the back and forth movement of my jig saw mounted is barely enough to feel let alone see. On my MK 7 (upgraded MK V 520) there is no movement at all.

Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 5:51 pm
by jsburger
jsburger wrote: Sat Mar 26, 2022 5:48 pm
edma194 wrote: Sat Mar 26, 2022 4:57 pm I agree with Tom on this subject. I guess I never saw it written down anywhere to leave some space for the spring to compress but I had some prior familiarity with elastomeric couplings and assumed it was necessary. The vibration feedback through the coupler can be a problem when there's a stiff connection between the hubs. The material is strong enough to withstand it though, along with any withstanding flexing necessary to account for misalignment of the hubs.

Since there aren't widespread reports of couplers breaking and I'm sure plenty of people who jam those things in as tight as possible then in the end it doesn't seem to matter much. Those couplers are tough.
Tom is certainly entitled to his opinion and he clearly stated it was his opinion in the video. I am sucribed to Tom's channel and he is spot on with his videos.

However, I found it interesting he used his power station instead of his MK V to make his point. He clearly needs to adjust the lock on his power station. Mine is not overly tight to lock and the back and forth movement of my jig saw mounted is barely enough to feel let alone see. On my MK 7 (upgraded MK V 520) there is no movement at all.

Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 5:54 pm
by jsburger
edma194 wrote: Sat Mar 26, 2022 4:57 pm I agree with Tom on this subject. I guess I never saw it written down anywhere to leave some space for the spring to compress but I had some prior familiarity with elastomeric couplings and assumed it was necessary. The vibration feedback through the coupler can be a problem when there's a stiff connection between the hubs. The material is strong enough to withstand it though, along with any withstanding flexing necessary to account for misalignment of the hubs.

Since there aren't widespread reports of couplers breaking and I'm sure plenty of people who jam those things in as tight as possible then in the end it doesn't seem to matter much. Those couplers are tough.
Tom is certainly entitled to his opinion and he clearly stated it was his opinion in the video. I am subscribed to Tom's channel and he is spot on with his videos.

However, I found it interesting he used his power station instead of his MK V to make his point. He clearly needs to adjust the lock on his power station. Mine is not overly tight to lock and the back and forth movement of my jig saw mounted is barely enough to feel let alone see. On my MK 7 (upgraded MK V 520) there is no movement at all.

Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 6:37 pm
by JPG
Third time the charm?

BTW the spt mount on the power station is always sloppy.

Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 6:42 pm
by jsburger
Some time it takes more than once.

Well my power station is not anywhere near as sloppy as Tom's. Not even close.

Re: My Growth Rings with Scott Markwood

Posted: Sat Mar 26, 2022 6:58 pm
by JPG
Maybe he 'cheated' and did not secure the slide.