Mark V sluggish in the cut
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Mark V sluggish in the cut
Hey all- I purchased my Mark V in the 80’s. Recently it is slowing down in the cut. I checked all the obvious: sharp blade, square table fence, proper power supply. So I suspect the motor given the age of it. I was going to take it to a local motor repair shop to have them check it out. Any thoughts on what I should check first?
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JPG
- Platinum Member
- Posts: 35600
- Joined: Wed Dec 10, 2008 7:42 pm
- Location: Lexington, Ky (TAMECAT territory)
Re: Mark V sluggish in the cut
Slipping Poly-v belt. Adjust the eccentric.
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╟JPG ╢
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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
╟JPG ╢
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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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chapmanruss
- Platinum Member
- Posts: 4555
- Joined: Tue Aug 26, 2014 8:16 pm
- Location: near Portland, Oregon
Re: Mark V sluggish in the cut
PoconoJim,
Welcome to the Shopsmith Forum.
I would also first check if the upper Poly V Belt is slipping as JPG suggests. Check the tension through the opening indicated by the red arrow in the picture below. On most Headstock Castings that opening is on both the back, as shown, and the front.
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If it has too much deflection it can be adjusted by turning the Eccentric Sleeve on the Idler Shaft Assembly. In the picture below there is a slot in the Eccentric just above the screw indicated by the green arrow. Loosen the Cap Screw and Nut indicated by the black arrow and turn the Eccentric moving the slot towards the top to increase the tension. Retighten the Cap Screw and Nut but be careful not to over tighten this as it can fracture the casting.
Just a note that not all Headstocks have both or either of the screws indicated by the blue and green arrows. Not all Eccentrics have the split indicated by the red arrow. These are just a couple of the changes that have occurred over the years to the Mark 5/V Conventional Headstock.
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Welcome to the Shopsmith Forum.
I would also first check if the upper Poly V Belt is slipping as JPG suggests. Check the tension through the opening indicated by the red arrow in the picture below. On most Headstock Castings that opening is on both the back, as shown, and the front.
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- Headstock B back w-arrow.jpg (71.04 KiB) Viewed 612 times
If it has too much deflection it can be adjusted by turning the Eccentric Sleeve on the Idler Shaft Assembly. In the picture below there is a slot in the Eccentric just above the screw indicated by the green arrow. Loosen the Cap Screw and Nut indicated by the black arrow and turn the Eccentric moving the slot towards the top to increase the tension. Retighten the Cap Screw and Nut but be careful not to over tighten this as it can fracture the casting.
Just a note that not all Headstocks have both or either of the screws indicated by the blue and green arrows. Not all Eccentrics have the split indicated by the red arrow. These are just a couple of the changes that have occurred over the years to the Mark 5/V Conventional Headstock.
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- Idler Shaft split eccentric arrows.jpg (124.8 KiB) Viewed 612 times
Russ
Mark V completely upgraded to Mark 7
Mark V 520
All SPT's, 2 Power Stations & Crafter's Station
Model 10ER S/N R64000 first one I restored on bench w/ metal ends & retractable casters.
Has Speed Changer, 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E's S/N's 1076 & 1077 oldest ones I have restored. Mark 2 S/N 85959 restored.
Mark V completely upgraded to Mark 7
Mark V 520
All SPT's, 2 Power Stations & Crafter's Station
Model 10ER S/N R64000 first one I restored on bench w/ metal ends & retractable casters.
Has Speed Changer, 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E's S/N's 1076 & 1077 oldest ones I have restored. Mark 2 S/N 85959 restored.
Re: Mark V sluggish in the cut
Is the blade clean? A buildup of pitch can slow cutting quite a bit.
- Matanuska
1984 Mark V upgraded to 520 PowerPro. Shopsmith cast iron table bandsaw, jointer, belt sander, and 60's vintage 610 jigsaw SPT's. Makita 2040 15" planer, JessEm Mast-R-Lift II router table.
1984 Mark V upgraded to 520 PowerPro. Shopsmith cast iron table bandsaw, jointer, belt sander, and 60's vintage 610 jigsaw SPT's. Makita 2040 15" planer, JessEm Mast-R-Lift II router table.