3450 rpm motor with 3'' pulley belted to a drive drum of a belt sander with a 4.5'' pulley. What size pulley's will it take to run a 1725 rpm motor the same speed as the 3450 with above pulley sizes.
It would take 6" pully w/ a 2.25" which would not fit on that machine, no room for the 6". Replace with the same RPM motor is the proper way, unless you simply want a slower speed sander, duh! You cannot change the motor rpm without a defenant power issue, if you change the rpm your sander will power out, sorry?
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you need max 5000 rpm for 10" blade if you have a 1725rpm motor and 1.5" pulley on saw,with a pulley of 4" on motor the saw rotate at 4600 rpm if the motor is 3450 rpm 2" pulley give 4533 rpm
Have you ever thought of a Motor Speed Controller, sort of a "Dimmer" for a motor? That way you could simply adjust your motor speed to what you want and compensate the error out?
The RPM's of the motor x the size of the pulley (3000rpm x 6inchs = 18000) = the output RPM's of the drive x the size of the pulley (in this case 800rpm x D ) Diameter would = 22.5 inchs.
Basically:
3000 X 6 / 800 = 22.5
You will have to change the pulley size on the motor to a smaller pulley. A 2" pulley on your motor would require a 7.5" pulley on your drive. Or you could use two belts to reduce the size of the pulleys even more. If you halve the RPMs to 1600 first from the 2" pulley you would need a 3.75" pulley followed by another belt hooked up to a 4" pulley to get your 800rpm. Hope this helps.
Hi,
Here is a link to Ingersoll-Rand (compressed air division) where you can find a local distributor. I think a call to a parts tech might provide the original motor sheave outside diameter and belt size (I'm suspecting "A" or "B" size).
I take it that the rear drum stopped turning and if so the drive belt or one if the pulleys could be your problem. I would be doubtful if the gears are stripped. Give me the model number and brand and I will find a schematic for you. If this is the Porter Cable sander. on the side with the black cover you will find 3 screws that you can remove, UNPLUG tool first and take a quick look to maybe find your problem. Let me know if I can help further
Instead of removing the drum, remove the belt and the cover over the gearbox. The gearbox cover is normaly fixed in place by screws around the drive pulley. There may be a couple of screws under the pulley, if so they can be accessed via holes in the pulley wheel itself. Check for worn or stripped gears. These gears can be replaced if need be, but if this is the case make sure you remove and clean out all the grease first and replace that aswell as it may contain bits of teeth that have come off the faulty gear. As far as I know belt sander drive rollers can not be removed without removing the drive inside the gearbox first.
hi
Step 1: Locate the belt by removing the back or front service panel. Depending on the type of dryer you own, you may have to prop up the drum to keep it from sagging. Don't let the drum hang; the bolts that hold it in the cabinet could be damaged. Don't remove any more parts than necessary. Step 2: Identify the belt. The old belt may be threaded around the idler pulley and motor drive shaft. Draw a diagram showing how the pulley is installed so you'll be able to replace it properly. If the old belt is worn or frayed, but not broken, leave it around the drum as a pattern for positioning the new belt; cut the old belt and remove it when the new belt is in position. Step 3: Remove the old belt from the pulleys and stretch the replacement belt into place. The new belt must extend around the dryer drum and the pulleys. The trick is to align the belt on the drum with the pulleys -- the ribs on the new belt go against the drum. Step 4: Once the belt is aligned, turn the drum by hand, if possible, to make sure the belt is tracking. You may have to reassemble part of the cabinet to do this.
Some older dryers have a V-belt pulley drum drive. With this system, two or three pulleys of different sizes set the speed of the drum. To change this type of belt, decrease the tension on the idler pulley and install the new belt in the V-grooves of all pulleys. Then place the idler pulley back into position. With any dryer, make absolutely sure that you replace the old belt with a new one made especially for the dryer. Any difference in belts can change the speed of the drum and cause problems with other dryer components.
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