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Milwaukee rf-115 pulley motor questions
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I'm looking at buying a Milwaukee rf-115 that someone disassembled some items.? Most importantly the motor, guard and gear box pulley.? The motor is not original, but everything else seems to be in good shape.? I read some post here indicating the saw was made by Rong Fu and I downloaded the recommended grizzly manual. Can anyone Tell me if these parts are interchangeable (referenced above)? Or can someone measure the shafts of there grizzle G0622 motor and gear box to see if this is the same??? The motor installed does not have the 3 tier pulley.? I assume I should change this.? I also wanted to very what RPM should be on the motor. Last item.? The nameplate on the saw indicated a blade spec: 1/2" x .025 x 64-1/2.? The grizzly manual indicated a .028 thick blade.? With the .028 blade work? Thanks for any help Jason F |
¿ªÔÆÌåÓýJason, ? I¡¯m not familiar with either the RF-115 or anything from Grizzly so can¡¯t help with the dimensions you asked about.? But for your other questions: ? The motor pulley should definitely be a 3-step of the same three diameters as the pulley that I guess is still on the saw.? Else, you will have to have three belts in order to change speed.? And you want to be able to do that as the optimum speed for example for aluminum is faster than for mild steel, which is faster than for some alloys. ? Common nameplate motor speeds are 1725, 1740 and 1750.? But any ? HP capacitor-start motor with RPM indicated between 1700 and 1800 will be fine. ? At least on my machine, both guide pinch bearing assemblies are adjustable.? So any blade in that range will be OK so long as you adjust the rollers if needed. ? Robert Downs ? From: 4x6bandsaw@... [mailto:4x6bandsaw@...]
Sent: Sunday, August 5, 2018 18:09 To: 4x6bandsaw@... Subject: [4x6bandsaw] Milwaukee rf-115 pulley motor questions ? I'm looking at buying a Milwaukee rf-115 that someone disassembled some items.? Most importantly the motor, guard and gear box pulley.? The motor is not original, but everything else seems to be in good shape.? I read some post here indicating the saw was made by Rong Fu and I downloaded the recommended grizzly manual. Can anyone Tell me if these parts are interchangeable (referenced above)? Or can someone measure the shafts of there grizzle G0622 motor and gear box to see if this is the same??? The motor installed does not have the 3 tier pulley.? I assume I should change this.? I also wanted to very what RPM should be on the motor. Last item.? The nameplate on the saw indicated a blade spec: 1/2" x .025 x 64-1/2.? The grizzly manual indicated a .028 thick blade.? With the .028 blade work? ? Thanks for any help Jason F ? ? |
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A quick search indicates motors for these saws run at 1725 RPM (HF, and Grizzly).? My Northern tool 4x6 also runs at 1725 RPM.
I removed my pulley cover because it rattled.? I never get my fingers anywhere near the pulleys during cutting so IMO It's not necessary.?? If your blade currently runs at a FPM (feet per minute) appropriate for the type of metal you cut most frequently you don't need a 3-step pulley.? Look at your Grizzly manual to determine the appropriate FPM for different types of metals and compare to your current set-up.? My saw is not a Grizzly or?Milwaukee rf-11 but the shaft on my motor and gearbox (NorthernTool saw) are both approx .585" diameter.?? You should be able to find the right size pulleys for the shaft diameters on your motor and gearbox with a little bit of research.? Measure them first then call grizzly or do a simple google search (ebay, grainger, mcmaster carr, essentra components, etc.).?? Good luck. ? |
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Thanks for the info.? I can buy universal 3 attack pulleys if I know the diameters of the pulley to get the right FPM.? ?Or if someone know the ratio of the warm gear.
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Thanks for the info.?
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Hi Jason
The pulleys on these saws are not?a matched pair, the motor pulley is smaller than the gearbox pulley, and you do?have to change the belt tension every time you change gear. The std motor pulley's 3 OD-of-flange measurements are 1.89", 2.15" and 2.55".? This is for an RF128 which has identical motor and?20:1 reduction?gearbox to the RF115.? All these older saws have std NEMA 56?5/8"?shaft diameter on motor and gearbox, some of the newer ones might be different. Measure your blade speed by spirit- or paint-marking the blade at one point next to the teeth, switching on and counting the number of times the mark goes past the guides in a minute.? Multiply that number by 5.4 to get FPM.? If the gearing on yours puts the blade speed at 300FPM?or less, and you cut only mild steel and aluminum, you won't need to change the pulley, you just have to use a bi-metal blade (10-14 TPI is a good start) which can cut both mild steel and aluminum at up to 300FPM (blue-colored carbon steel ones can't). Aluminum can be cut at 400FPM if the motor is strong enough, but that's too fast for mild steel. If you cut stainless or hi-tensile steel you need a low speed in 65- 100FPM range. Then you will need a multi-step pulley.?? I don't think there is anything magical about the speeds they're just Hi Med & Lo.? If you put on any A-section 3-step pulley it'll be ok as long as its slow enough for the slowest cutting material.? Just measure the actual speed as above, and choose according to the material you're cutting. I dispensed with the pulley guard too, as it makes it easier to change gear, but will have to put it back now the grandchildren are in the workshop. Motors on US saws all run 1725rpm,?but the rest of the world runs 1425rpm motors with exactly the same pulley diameters as US saws, we just run slower (50Hz vs 60Hz).?? Check out the Files section of the site (in the header: Conversations Photos Files More) - there's a doc on which motors fit and which don't. You won't get a direct replacement (HP, shaft diameter and length) unless you buy the motor as a spare part. RF are still in business but don't know who represents them in US. Blades are made world wide from blade stock that is 1/2"x 0.025"x 64-1/2" std. The metric blades substitute nearest millimeter size to imperial.? 0.028" can only be some Grizzly employee measuring it wrong or they've got a weird supplier...? Rgds - jv ? |