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Re: Yet another 3D printed coupler design
Posted: Mon Jan 11, 2021 6:58 pm
by RFGuy
dusty wrote: ↑Mon Jan 11, 2021 5:53 pm
I had difficulty removing the springs from broken couplers and ultimately discarded them. I'll never learn. I keep things I never use again and then discard what I need.
Has anyone tried to find a spring replacement in the past for the couplers? Wondering if something like this would work:
https://www.amazon.com/Yuyuvan-Compress ... 385&sr=8-2
Re: Yet another 3D printed coupler design
Posted: Mon Jan 11, 2021 7:58 pm
by jsburger
RFGuy wrote: ↑Mon Jan 11, 2021 6:58 pm
dusty wrote: ↑Mon Jan 11, 2021 5:53 pm
I had difficulty removing the springs from broken couplers and ultimately discarded them. I'll never learn. I keep things I never use again and then discard what I need.
Has anyone tried to find a spring replacement in the past for the couplers? Wondering if something like this would work:
https://www.amazon.com/Yuyuvan-Compress ... 385&sr=8-2
can you replace the spring on a SS coupler? If so why?
The OP says he can supply couplers with springs on either end or both ends. Why? The reason for the SS coupler spring on the head stock end is so that when you move the head stock to remove an SPT the coupler remains with the SPT. Or at least is not on the head stock. That way when you start the head stock the coupler does not come flying off if you forgot it was there. SAFETY
Re: Yet another 3D printed coupler design
Posted: Mon Jan 11, 2021 9:06 pm
by JPG
jsburger wrote: ↑Mon Jan 11, 2021 7:58 pm
RFGuy wrote: ↑Mon Jan 11, 2021 6:58 pm
dusty wrote: ↑Mon Jan 11, 2021 5:53 pm
I had difficulty removing the springs from broken couplers and ultimately discarded them. I'll never learn. I keep things I never use again and then discard what I need.
Has anyone tried to find a spring replacement in the past for the couplers? Wondering if something like this would work:
https://www.amazon.com/Yuyuvan-Compress ... 385&sr=8-2
can you replace the spring on a SS coupler? If so why?
The OP says he can supply couplers with springs on either end or both ends. Why? The reason for the SS coupler spring on the head stock end is so that when you move the head stock to remove an SPT the coupler remains with the SPT. Or at least is not on the head stock. That way when you start the head stock the coupler does not come flying off if you forgot it was there. SAFETY
i.e. spring the headstock end ONLY!
Re: Yet another 3D printed coupler design
Posted: Mon Jan 11, 2021 10:57 pm
by paulrussell
I am not supplying springs. Only a nylon coupler. I made the coupler symmetric, so in theory a spring could be used at either end or both. I'm not advocating dual springs, nor a spring at the SPT end while in use, and am going to edit my prior post. I should have never mentioned it.
Sorry for any confusion and/or misinformation.
Re: Yet another 3D printed coupler design
Posted: Mon Jan 11, 2021 11:01 pm
by paulrussell
dusty wrote: ↑Mon Jan 11, 2021 5:53 pm
I had difficulty removing the springs from broken couplers and ultimately discarded them. I'll never learn. I keep things I never use again and then discard what I need.
I had to drive them out, cut the coupler, or both. The Shopsmith coupler shaft is tapered slightly and the end of the spring can really get wedged in tight.
Re: Yet another 3D printed coupler design
Posted: Sat Jan 16, 2021 7:11 am
by dusty
paulrussell wrote: ↑Mon Jan 11, 2021 4:20 pm
To those who are getting the first batch of couplers:
You should have gotten a PM from me.
Using a Shopsmith spring on the headstock end will make removal of the coupler much easier. The coupler is intentionally a bit snug when new. After a couple uses the slight "ribbed" texture to the 3d printed part that should smooth out on the mating surfaces.
BTW: I prefer my couplers to have a snugger fit than the white couplers I've purchased over the last few years. The fit is closer to my old-school nylon coupler.
tbolish wrote: ↑Wed Jan 06, 2021 1:56 am
I’d be interested in check one of these out if you have any more available. Thanks!
I'll keep you in mind for round 2. I want to get feedback from a few users before I move forward.
I received mine yesterday. I plan to install it today in a band saw configuration first. Why? The bandsaw configuration is the easiest for me to get properly aligned couplers. I don't want to break this before I can use it. I did not retain the springs from my two broken couplers so I will be testing without the spring. I will wax to hubs to assist in coupler removal. I will post result later - much later.
Re: Yet another 3D printed coupler design
Posted: Sat Jan 16, 2021 8:14 am
by dusty
Congratulations on a job well done. The coupler fits the hubs just great.
I had to fine tune hub alignment but that was not the fault of the coupler. Gotta conduct an investigation to determine who done it.
Re: Yet another 3D printed coupler design
Posted: Sat Jan 16, 2021 10:09 am
by paulrussell
dusty wrote: ↑Sat Jan 16, 2021 8:14 am
Congratulations on a job well done. The coupler fits the hubs just great.
I had to fine tune hub alignment but that was not the fault of the coupler.
Gotta conduct an investigation to determine who done it.
Thanks for the update Dusty! Looking forward to hearing more, be it good or bad.
For those who might be wondering, the 3D printed coupler has a slight surface texture as a result of the printing process. I anticipate that this will smooth out where the coupler mates after a few uses, thus very slightly enlarging the socket. For that reason the couplers are just a bit snug, so that after a bit of use they fit perfectly. At least that is the plan.
So I suggest a bit of wax to ease removal during this break-in period. An original Shopsmith spring really helps at the headstock end.
Re: Yet another 3D printed coupler design
Posted: Sat Jan 16, 2021 10:17 am
by dusty
After setting up and making a few test cuts, I pulled the headstock away from the bandsaw (to disconnect). Unlike normal, the coupler remained with the headstock (no spring). The coupler was a bit stubborn in that it did not pull off easily. This could be a perfect way to "break couplers". Pull straight away - no wiggling.
Re: Yet another 3D printed coupler design
Posted: Sat Jan 16, 2021 11:22 am
by paulrussell
Dusty
Yes. Without the spring it is tricky. WIth a spring it pops right off -- at least on my machine. It was a really tough design decision as to how snug the couplers should fit, especially since I believe they will loosen up a bit after some use. One of my pet peeves of the later white couplers is that I found them a bit loose compared to the vintage editions.
However, I might need to rethink how snugly these the fit as I get more feedback.