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Re: Scroll Saw Won't Hold Tension Under Power
Posted: Sat Dec 12, 2015 8:30 pm
by algale
JPG wrote:No, but
10,81,85 x 3
95,86,110 x 2
7,95 , 7,8
With the tension released, you should be able to detect any play by pulling up/pushing down on the rod.
Yeah, that list of parts looks about right to get in there. There goes my Sunday and lord knows what else!
Question, should I be able to determine if there is play in those parts BEFORE I go to the trouble of disassembling it just by releasing tension and doing the push/pull on the rod?
Re: Scroll Saw Won't Hold Tension Under Power
Posted: Sat Dec 12, 2015 8:41 pm
by JPG
algale wrote:JPG wrote:No, but
10,81,85 x 3
95,86,110 x 2
7,95 , 7,8
With the tension released, you should be able to detect any play by pulling up/pushing down on the rod.
Yeah, that list of parts looks about right to get in there. There goes my Sunday and lord knows what else!
Question, should I be able to determine if there is play in those parts BEFORE I go to the trouble of disassembling it just by releasing tension and doing the push/pull on the rod?
That be why I mentioned it. If no play, we need to look elsewhere and not take it apart. Realize the rod passes
through several parts.
Re: Scroll Saw Won't Hold Tension Under Power
Posted: Sat Dec 12, 2015 9:48 pm
by algale
Well, I unscrewed the rear tension cam/lever and immediately discovered at least part of the problem.
- IMG_2792.JPG (125.51 KiB) Viewed 2760 times
I have a hard time believing that this would bend before the cam/lever would break, but hey, I'm no engineer. Is it possible that over tensioning caused this?
There also does seem to be play in the rod, so I suspect I will find the roll pin wear issue JPG had.
So, it is time to disassemble and figure out what other parts I need to order and hope the mothership can get em to me.
To be continued....
Re: Scroll Saw Won't Hold Tension Under Power
Posted: Mon Dec 14, 2015 2:39 pm
by algale
Further disassembly reveals that the tension pin holding the tension rod has NOT damaged the arm casting.
Slop must solely be in the tensioning rod itself, which needs replacing anyway because it is bent.
- IMG_2796.JPG (179.14 KiB) Viewed 2721 times
- IMG_2795.JPG (145.75 KiB) Viewed 2721 times
Waiting on replacement parts from Shopsmith.
Maybe that will give me time to ponder how I'm going to drive out that tension pin. I can't take the arm over to my bench because the arms is held in to the base by another tension pin (part 16A, which connects the arm to the piston for the air pump as seen here
http://www.shopsmith.com/service/scroll ... iagram.htm). I can't figure how to drive either pin out and am afraid of whacking on the arm in place.
Re: Scroll Saw Won't Hold Tension Under Power
Posted: Mon Dec 14, 2015 2:52 pm
by reible
Could that damage have happen in shipping? Was this unit shipped that you know of?
Ed
Re: Scroll Saw Won't Hold Tension Under Power
Posted: Mon Dec 14, 2015 2:56 pm
by algale
reible wrote:Could that damage have happen in shipping? Was this unit shipped that you know of?
Ed
I presume that, like most Shopsmith equipment, it was shipped to the original owner. I'm at least one and possibly two owners removed from that (I forget). Suffice it to say, I picked it up in person off of CL (a year ago).
Re: Scroll Saw Won't Hold Tension Under Power
Posted: Mon Dec 14, 2015 4:06 pm
by JPG
Re removing the tension pin.
3 to 4 hands required.
Hold a heavy object against the arm, but do not obstruct pin exiting.
Use a pin punch to drive the pin through the arm. It may scarf the inside of the hole depending upon the wear.
Re: Scroll Saw Won't Hold Tension Under Power
Posted: Mon Dec 14, 2015 4:37 pm
by algale
JPG wrote:Re removing the tension pin.
3 to 4 hands required.
Hold a heavy object against the arm, but do not obstruct pin exiting.
Use a pin punch to drive the pin through the arm. It may scarf the inside of the hole depending upon the wear.
Hmmm. Thinking dumbbell.
Re: Scroll Saw Won't Hold Tension Under Power
Posted: Mon Dec 14, 2015 4:40 pm
by BuckeyeDennis
algale wrote:JPG wrote:Re removing the tension pin.
3 to 4 hands required.
Hold a heavy object against the arm, but do not obstruct pin exiting.
Use a pin punch to drive the pin through the arm. It may scarf the inside of the hole depending upon the wear.
Hmmm. Thinking dumbbell.
Who, JPG???
Re: Scroll Saw Won't Hold Tension Under Power
Posted: Mon Dec 14, 2015 5:00 pm
by algale
BuckeyeDennis wrote:algale wrote:JPG wrote:Re removing the tension pin.
3 to 4 hands required.
Hold a heavy object against the arm, but do not obstruct pin exiting.
Use a pin punch to drive the pin through the arm. It may scarf the inside of the hole depending upon the wear.
Hmmm. Thinking dumbbell.
Who, JPG???
He most definitely is NOT one! But LMAO!