Old MKVII motor
Moderators: HopefulSSer, admin
Old MKVII motor
I haven’t torn into it yet, but I was using my ‘67 mkvii last week with a small wire wheel in the chuck, when one time when I went to turn it on it wouldn’t run in the forward rotation. It just hums and vibrates.
It seems to run fine in reverse.
I’m hopeful that it’s maybe just the switch.
I would appreciate any thoughts or suggestions from the experts before I take it apart.
K
It seems to run fine in reverse.
I’m hopeful that it’s maybe just the switch.
I would appreciate any thoughts or suggestions from the experts before I take it apart.
K
BigK
1967 MK VII with Band Saw, 6 x 48 Belt Sander, Jointer and many small accessories
Ridgid Contractors Saw
Delta 9” RAS
2 DeWalt MBF RAS’s
14” Delta Drill Press
1967 MK VII with Band Saw, 6 x 48 Belt Sander, Jointer and many small accessories
Ridgid Contractors Saw
Delta 9” RAS
2 DeWalt MBF RAS’s
14” Delta Drill Press
- JPG
- Platinum Member
- Posts: 34610
- Joined: Wed Dec 10, 2008 7:42 pm
- Location: Lexington, Ky (TAMECAT territory)
Re: Old MKVII motor
Leave the motor alone!bigk01 wrote:I haven’t torn into it yet, but I was using my ‘67 mkvii last week with a small wire wheel in the chuck, when one time when I went to turn it on it wouldn’t run in the forward rotation. It just hums and vibrates.
It seems to run fine in reverse.
I’m hopeful that it’s maybe just the switch.
I would appreciate any thoughts or suggestions from the experts before I take it apart.
K
Dive into the switch(not a pleasant task).
Do NOT do the hum test often nor 'longly'.
The contacts lose their spring with use/age.
VERY carefully 'form' the spring contacts.
If arcing has eroded the contacts, all bets are off.
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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
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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: Old MKVII motor
Thanks for the reply.
Believe me the last thing I want to do is mess with the motor.
As soon as I get a little time, I will pull the headstock and try to rebuild the switch.
Thanks again,
K
Believe me the last thing I want to do is mess with the motor.
As soon as I get a little time, I will pull the headstock and try to rebuild the switch.
Thanks again,
K
BigK
1967 MK VII with Band Saw, 6 x 48 Belt Sander, Jointer and many small accessories
Ridgid Contractors Saw
Delta 9” RAS
2 DeWalt MBF RAS’s
14” Delta Drill Press
1967 MK VII with Band Saw, 6 x 48 Belt Sander, Jointer and many small accessories
Ridgid Contractors Saw
Delta 9” RAS
2 DeWalt MBF RAS’s
14” Delta Drill Press
Re: Old MKVII motor
You don't need to pull the headstock. Just undo the nut holding the switch. BEFORE ya disconnect the switch, take a pic so ya know where the wires go back to.
SS 500(09/1980), DC3300, jointer, bandsaw, belt sander, Strip Sander, drum sanders,molder, dado, biscuit joiner, universal lathe tool rest, Oneway talon chuck, router bits & chucks and a De Walt 735 planer,a #5,#6, block planes. ALL in a 100 square foot shop.
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Bob
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Bob
- JPG
- Platinum Member
- Posts: 34610
- Joined: Wed Dec 10, 2008 7:42 pm
- Location: Lexington, Ky (TAMECAT territory)
Re: Old MKVII motor
beeg wrote:You don't need to pull the headstock. Just undo the nut holding the switch. BEFORE ya disconnect the switch, take a pic so ya know where the wires go back to.
ALL 8 or nine wires????
![Big Grin :D](./images/smilies/biggrin.gif)
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╟JPG ╢
╚═══╝
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 ╢
╚═══╝
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: Old MKVII motor
YES!JPG wrote:beeg wrote:You don't need to pull the headstock. Just undo the nut holding the switch. BEFORE ya disconnect the switch, take a pic so ya know where the wires go back to.
ALL 8 or nine wires????
or the next question will be "WHERE do these wires connect."
![Big Grin :D](./images/smilies/biggrin.gif)
![Big Grin :D](./images/smilies/biggrin.gif)
SS 500(09/1980), DC3300, jointer, bandsaw, belt sander, Strip Sander, drum sanders,molder, dado, biscuit joiner, universal lathe tool rest, Oneway talon chuck, router bits & chucks and a De Walt 735 planer,a #5,#6, block planes. ALL in a 100 square foot shop.
.
.
Bob
.
.
Bob
- everettdavis
- Platinum Member
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- Joined: Thu Jul 17, 2014 11:49 am
- Location: Lubbock, TX
Re: Old MKVII motor
I can help with that just a bit. https://www.shopsmith.com/ss_forum/view ... 90#p185690beeg wrote:YES!JPG wrote:beeg wrote:You don't need to pull the headstock. Just undo the nut holding the switch. BEFORE ya disconnect the switch, take a pic so ya know where the wires go back to.
ALL 8 or nine wires????
or the next question will be "WHERE do these wires connect."![]()
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Follow the My Google Drive link, select the "Mark VII - 1960's vintage" folder
When you start seeing things like these..... download what you need. It's Free
There are even some blank motor wiring diagrams in case your colors are different that allow you to define what you have. Pictures are good, but colors sometimes get sketchy.
Everett
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- Gold Member
- Posts: 84
- Joined: Sun Apr 21, 2019 11:21 am
- Location: Prescott AZ
Re: Old MKVII motor
I had the same experience shortly after I started using my VII. After checking out the wiring carefully, I narrowed the problem down to the start capacitor. Mine was a GE motor.bigk01 wrote: one time when I went to turn it on it wouldn’t run in the forward rotation. It just hums and vibrates.
- JPG
- Platinum Member
- Posts: 34610
- Joined: Wed Dec 10, 2008 7:42 pm
- Location: Lexington, Ky (TAMECAT territory)
Re: Old MKVII motor
Ah, but, his only fails in ONE direction, hence the switch is de prime suspect.StevenAyres wrote:I had the same experience shortly after I started using my VII. After checking out the wiring carefully, I narrowed the problem down to the start capacitor. Mine was a GE motor.bigk01 wrote: one time when I went to turn it on it wouldn’t run in the forward rotation. It just hums and vibrates.
╔═══╗
╟JPG ╢
╚═══╝
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 ╢
╚═══╝
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: Old MKVII motor
Thanks again to everyone who has replied.
I just took a quick look and I can’t see anyway to get at the switch without talking the headstock off the rails. It doesn’t look like the motor cover will drop between the lower tubes.
Am I missing something?
It’s a little tough wrestling the headstock by myself, but I have done it before.
I just took a quick look and I can’t see anyway to get at the switch without talking the headstock off the rails. It doesn’t look like the motor cover will drop between the lower tubes.
Am I missing something?
It’s a little tough wrestling the headstock by myself, but I have done it before.
BigK
1967 MK VII with Band Saw, 6 x 48 Belt Sander, Jointer and many small accessories
Ridgid Contractors Saw
Delta 9” RAS
2 DeWalt MBF RAS’s
14” Delta Drill Press
1967 MK VII with Band Saw, 6 x 48 Belt Sander, Jointer and many small accessories
Ridgid Contractors Saw
Delta 9” RAS
2 DeWalt MBF RAS’s
14” Delta Drill Press