motor pulley size : Delta10″ contr. saw?
Just got my Delta 10″ contractors’ saw out of storage – it’s an old one, with a 1.5hp 120v motor – and am in the process of setting it up again. I was surprised to find 2 motor drive pulleys in the box with the misc. parts, and they are not the same size. I don’t know which is the correct one.
A look at the manual and parts drawing references it only by name and part number – it does not specify the diameter.
Does anyone out there know?
Even if you don’t know the stock diameter for this particular saw, is there a rule of thumb for relating the size of the motor pulley to the arbor pulley (i.e. perhaps they should be the same?).
FYI – I’m not at home, so I don’t have more specifics about the saw’s model number, or the diameter(s) of the pulleys – but I was hoping the information is generic enough that someone might be able to help. Also FYI in the immediate future all I’ll be doing is some light cabinet work, working with 3/4″ ply and particle board.
Thanks!
Replies
All that I have seen are about the same size as on the saw-arbor. If you go larger, you will spin the blade faster, but have less torque.
Since you aren't getting much response, let me make an educated guess. It seems most ten inch saws run about 3450 rpm or a little more. If you have a 3450 rpm motor the pulleys should be about the same diameter. If the motor is 1725 rpm, you might need the motor pulley to be about twice the diameter as the arbor pulley.
3" on the motor, 2" on the arbor.
Beat it to fit / Paint it to match
Don't care to be disagreeable, but my Delta contractor saw (1.5 HP, 120V) has a 2.25-inch pulley on the motor. Can't easily get to the arbor pulley, but it seems to be about a quarter inch or so larger. The manual shows it as two pieces! Like yours, part numbers without dimensions. Around 4000 RPM is a good rotational speed. Some carbide-toothed blades and moulding heads warn of danger at high rotational speeds.
Cadiddlehopper
Thanks to all for the feedback. I hadn't thought about this in terms of blade RPM's, but that makes sense. I had been thinking that intended torque was what drove (no pun intended) the equation.
My motor is rated at 3450 rpm, so it seems like roughly 1:1 with the arbor pulley would be appropriate.
I forgot to mention in my original post that what made me especially concerned was that in the original instruction/assembly manual, photos show the motor pulley as clearly much larger than the two pulleys I've got (which are both roughly equal to the arbor pulley). Maybe in the model that is pictured the motor was 1725 rpm?
In any case, it's surprising that this isn't specified in the manual. It seems pretty important. On Monday I'm going to try to speak to someone at Delta; I'll post the result of that...
Thanks again
P.S. After setting up this saw, I have to say that I appreciate it as a piece of machinery. I have work being done in my house, and so I had occasion to use two of the carpenters' jobsite saws (a Makita and a Skil). This thing seems like a Unisaw in comparison. Don't know if they're still being made this solid, but I'm glad I've got it.
What diameters do you have? If this saw is 20 years old or more, you might want to stop over at http://www.owwm.org, the Old Woodworking Machines site. Someone there will be familiar with this machine.Pete
Motor pulley 3" arbor pulley 2.5" = 4140 RPM
Motor pulley 2.5" arbor pulley 3" = 2875 RPM
Life is what happens to you when you're making other plans .
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