Question about Delta Machinery DJ20 8" Jointer with Stand

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Lost key between motor and pulley What size is the key?

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From what I have seen on the three seperate models of jointers in the DJ20 series there is no woodruff key between the motor shaft and the pulley. I know there is a slot there though. There should only be a set screw that holds the pulley in place. The only woodruff key used on this model is for the cutterhead and pulley assembly and the part number for that is 428070790005. If you are certain there is a woodruff key that goes between the motor and motor pulley you may want to contact your local dewalt service center and inquire as to how you can obtain a replacement.

Posted on Oct 14, 2009

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The pulley on the compessor only came in one size ~ about 10 inch. The motor size pulley would depend on the speed of the motor. To get a good volume of air, the pump needs to turn about 800 to 1000 rpm(most pumps have max rpm at that range, good idea to check ). Gas engine turns at 3000 ~ 3600 rpm so use about 3" pully or determine by counting the number of turns of motor/engine to make one revolution of the pump. Electric motors will turn 3450 or 1725. Choose pulley to turn pump at desired speed below max pump rpm and capacity of the motor.

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Hello'
I have the exact same saw. It sounds like the key stock came out of the pulley attached to the lower wheel. I will give you a quick rundown.
-unplug saw
-you will have to lay the saw on its side so you can remove the motor and drive belt.
-there are 2 seperate pulleys , the one connected to the motor and the one connected to the bottom wheel.
-loosen motor nuts and remove motor, pay close attention when removing motor 3 of the 4 studs have sleeve like spacers.
-once motor and belt are out of the way check the pulley on the bottom wheel,my guess is that the key stock came out and the pulley spins freely.
-loosen set screw,replace keystock and tighten.
-NOTE the keystock may have came out of the motor pully instead,check.

Now this next part is real important.
-once you get it figured out and are ready to put everything back together the 2 pulleys must be perfectly lined up, use a flat ruler, using your eye will not work.line the drive pulley up with the lower pulley. ( the pulley on the motor has a shoulder on it so when it is pushed towards motor it will be set in the right spot) .

It is either the pulley on the motor or the wheel that has lost its keystock.

It should be a easy fix,Good luck

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One dealer for your model compressor is Northern. They are very good at replacement parts. If you do not have 3 phase power, you could shop around for 5 to 7 hp 220 v motor making sure that the motor mount will align with your plate. Pully size depends on dia. of pulley on the pump. Most pumps turn between 550 min to 1100 rpm depending on the power available and cfm requirements. Most motors turn at 1725 rpm so for example if your compressor has a 14 in. pulley then you motor will need a 5 in. pulley to turn it about 620 rpm. The larger the pulley at the motor the higher cfm produced but more amps used. Motor speed x pulley dia. divided by compressor pulley dia. To obtain more efficiency and highest cfm you will need 3 phase. Good place to see motors and two piece pulley combnations is www.grainger.com. Good luck

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I have a engine on my sawbench which is rated at 3000 r.p,m thepulley on the output is 6 ins .what size pulley do i need on the saw to make it turn at 800 r.p.m.


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.

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You can change the size of the pulleys. Either increase the fan pulley size or lower the motor pulley size. Don't go more than 1 inch at a time. You will also have to change the length of the belt. The motor runs at 1725 rpm's.

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1 Answer

I have a 20 year old table saw of unknown manufacturer (but all machne parts are metric). The spindle pulley (mounted on motor spindle - it accepts v-belt from motor pulley) keeps coming loose. i think the...


Simple, there are two options:
1) buy a new pulley from any hardware or home improvement store.
2) If threads are stripped from pulley, either retap with next larger size tap, or redrill new hole and tap with same size as the current size. Note the best way to keep pulley on is to have a set screw over the key and another at 90 degrees from keyway. Note 2 - Are you sure current pulley does have two set screws?

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1 Answer

Motor & pulley


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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1 Answer

What size a step pulley required for the motor ?


rpm_chart.jpg?t=1236890602
here is the chart you need to answer your question. please mark this as a fixya! thanks

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