View Full Version : Speed Control -- Question
BigSky
07-02-2008, 06:30 AM
When the speed control becomes difficult to change -- is it the mismatch in gears of the quadrant that is the root cause or are there other probable factors?
Is it equally difficult to change speeds in both directions?
billmayo
07-02-2008, 08:13 AM
Have you put 4-6 drops of non-detergent #10 (instrument, sewing machine or air compressor) oil in the hole on the control sheave lately? Using a heavier weight or a detergent oil for lubrication or not oiling for long periods of time can cause the control sheave to be hard to move putting more stress on the quadrant gear teeth thus making the speed control handle harder to turn.
When turning from FAST to SLOW, you need to go slow to allow the sheaves to adjust for the motor belt. Forcing or turning quickly can cause the quadrant gear teeth to become misaligned with the worm gear. Going from SLOW to FAST should be easy and quick to do. Also forcing the speed control handle from FAST toward SLOW without the motor operating will do major damage to the quadrant.
See my reply #32 on Woodworking Tool Review, Shopsmith Inc. quality of sources thread for additional comments.
This one gets you to 25 maintenance procedures:
http://www.allinonewood.com/?page=shop/serviceadvisor
This one gets you to instructions and manuals:
http://www.shopsmith.com/ownersite/productmanuals.htm
I recommend copying all of these procedures, instructions and manuals to a CD for current and later use.
When the speed control becomes difficult to change -- is it the mismatch in gears of the quadrant that is the root cause or are there other probable factors?
Is it equally difficult to change speeds in both directions?
wood4me
08-08-2008, 07:39 PM
i hope this works for mine :o ...it keeps tripping the breaker...and difficult if any to turn from e - h seems to be stuck at this r.p.m. :mad: ......to my knowledge it has never been turned off unless it was at "a" :)
Wood4me
Remember to clean and lube the quadrant gear teeth, but FIRST unplug the SS.
"...it keeps tripping the breaker..."
This is an indication that you've got problems that lubrication probably won't fix. Strongly suggest you unplug the Mark V and thoroughly inspect the drive train. Do either of the shafts that protrude from the back of the headstock feel warm after they have been running for a few minutes? Assess the condition of the belts first, then remove the belts and see that all bearings rotate smoothly by hand, including the small bearing at the back of the control sheave.
With all good wishes,
wood4me
08-08-2008, 09:56 PM
Thanks for the replys :) .....
beeg.....sorry that didnt work...appears using last 1/4 of the quadrant
gear teeth - could this have slipped and needs adjusting :confused:
Nick....belts are ok.....unit does run smoothly when turned it by hand....
the unit will run approximatly 20-30 seconds before tripping the
breaker...
wood4me
08-09-2008, 08:17 AM
when i look at the gear assembly from the access hole with the speed control at 12:00 and the access hole at 6:00 the quardant gear is using the gear between 7:00 and 8:00...hurray - its not the motor as many of you already knew - took of the drive belt ran smooth .....
when i look at the gear assembly from the access hole with the speed control at 12:00 and the access hole at 6:00 the quardant gear is using the gear between 7:00 and 8:00...hurray - its not the motor as many of you already knew - took of the drive belt ran smooth .....
HAHAHA I just NOW figured out what is going on with the clock positions you mentioned. Post the letter your on, the speed dial has several 12:00 speed positions. When mine it set to "T" the gear is almost to the closest end of the gear, when looking through the rear access hole. When it's set to "SLOW", it's all the way to the other end.
This might help you to.
http://www.shopsmithacademy.com/SS_Archives/SS117/SS117_Replacing_Speed_Changer.htm