Spindle Max Speed
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- shipwright
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Spindle Max Speed
I brought my digital tach home from the boat the other day to check speeds I was getting with my Mark VII cam arrangement and since it was there I checked some speeds on my 510 with link belt and with vee belt. I was surprised to see numbers well above the stated 5200 max rpm. So much so in fact that I checked my 3Hp Unisaw to verify the accuracy of the tachometer. The saw runs at 4300rpm and the tach gave it almost exactly that so I have to believe it is accurate.
My numbers for the 510 were:
With link belt (which gets well outside the motor sheaves, see pic)
Slow…..950rpm
Fast ….6340rpm
With the vee belt (worn, barely 1/2”)
Slow …. 730rpm
Fast ….7360rpm
Anyone able to explain what’s going on?
My numbers for the 510 were:
With link belt (which gets well outside the motor sheaves, see pic)
Slow…..950rpm
Fast ….6340rpm
With the vee belt (worn, barely 1/2”)
Slow …. 730rpm
Fast ….7360rpm
Anyone able to explain what’s going on?
Paul M ........ The early bird gets the worm but the second mouse gets the cheese
Re: Spindle Max Speed
SS speed are very much dependent on belt width. New V belt vs worn V belt vs how wide is the link belt. Speed vs letter setting on the dial is not a precise thing. A link belt is not a substitute for a V belt in this application.
John & Mary Burger
Eagle's Lair Woodshop
Hooper, UT
Eagle's Lair Woodshop
Hooper, UT
- shipwright
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Re: Spindle Max Speed
I’ve used link belts before as have some of the real gurus of ShopSmith. I have no problem with them and I know the belt width affects the speeds. My question is whether anyone can explain to me why in getting 2000rpm over the advertised max. That’s not a few percent.
Paul M ........ The early bird gets the worm but the second mouse gets the cheese
Re: Spindle Max Speed
Is there a low speed speed adjustment on the Mark VII like on the Mark V?
Gale's Law: The bigger the woodworking project, the less the mistakes show in any photo taken far enough away to show the entire project!
- shipwright
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Re: Spindle Max Speed
You mean high speed? Yes
Paul M ........ The early bird gets the worm but the second mouse gets the cheese
Re: Spindle Max Speed
Have you done the adjustment? Has the exchange of the V pulleys for the VII pulleys changed the geometry?
Gale's Law: The bigger the woodworking project, the less the mistakes show in any photo taken far enough away to show the entire project!
- shipwright
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Re: Spindle Max Speed
This is on the 510, not the Mark VII. The MkVII is currently waiting for a new (eBay) Mk V control sheave. I have proven that will work by trying a control sheave out of my Mk 5 but it needs 1/4” cut off to reach full speed. I’ll do that to the new one, not the Mk 5 one. It goes back where it came from.
So yes, the Mk V/5 sheave does change the geometry a bit because the spigot on the Mk VII sheave is a bit shorter.
I can fix that!
So yes, the Mk V/5 sheave does change the geometry a bit because the spigot on the Mk VII sheave is a bit shorter.
I can fix that!
Paul M ........ The early bird gets the worm but the second mouse gets the cheese
- JPG
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Re: Spindle Max Speed
The link belt riding so high on the motor pulley definitely explains the higher speed.
Where does the v-belt ride at 'high'?
BTW belt length also affects this in addition to belt width.
I think thy link belt is too long. Make it shorter and the spindle speed will decrease as the belt rides lower into the motor pulley.
Where does the v-belt ride at 'high'?
BTW belt length also affects this in addition to belt width.
I think thy link belt is too long. Make it shorter and the spindle speed will decrease as the belt rides lower into the motor pulley.
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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
- shipwright
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Re: Spindle Max Speed
I agree that the link belt is one too long but the worn, barely 1/2” vee belt ran the machine at 1000 rpm higher.
I really don’t get it.
I really don’t get it.
Paul M ........ The early bird gets the worm but the second mouse gets the cheese
- JPG
- Platinum Member
- Posts: 34683
- Joined: Wed Dec 10, 2008 7:42 pm
- Location: Lexington, Ky (TAMECAT territory)
Re: Spindle Max Speed
I think I would reexamine the 1/2" belt data/procedure. Those results do not make sense! I there is something else going on(multiple reflections if using an optical tach).
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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 ╢
╚═══╝
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