Question about Craftsman Grinders

1 Answer

Motor hums and dont turn but will pick up speed if you spin the wheels

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 256 Answers

Hi, I don't know which model you have but it either has a start capacitor or starter windings that are bad. That's why it will run with a start by you. If you are handy you can take it apart and replace a capacitor for a couple bucks. Start windings you need a multimeter to find the problem. Good Luck, this should Fixya!

Posted on Mar 03, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Motor hums will not start


A single phase motor needs an additional winding for starting. The winding is often isolated by a centrifugal switch. If the grinder is little used it would not be unusual to find the bob-weights and linkage to be seized.
It would seem time to dismantle the grinder and carry out some maintenance.

Dec 24, 2015 | Grinders

1 Answer

How do I dress a grinding wheel on a bench grinder with a viberating wheel.


Hello.
First of all I must warn you of the dangers bench grinders can represent. Here in Britain no one connected with a business is allowed to carry out any maintenance on any none-portable grinding machine unless they have attended and passed a course on the subject and every employer must keep a register recording what maintenance has been carried out and by whom. Grinding machines have been responsible for many industrial "accidents".
Householders and private individuals are exempt from the Law but cannot afford to be less well informed even though the five and six inch bench grinders sold to the domestic user represent a somewhat reduced risk, great care and precautions are still required, not the least of which is the use of good eye protection even if the grinder is fitted with shields.

The first problem about dressing the grinding wheel of a grinder intended for the domestic market is the tool rests are usually too small and insubstantial for the vibrating star-wheel type wheel dressing tool to be used correctly.
A demonstration would be the best way to learn how to dress a grinding wheel and there are many available on Youtube and here is a link to a particularly good video.

https://www.youtube.com/watch?v=RqxfJ4DtZtQ

Finally, it is best to be aware of one little thought about problem. There is an optimum speed range when a grinding wheel works efficiently and small domestic grinders barely turn fast enough for them to be properly efficient, probably because it is reckoned price and user safety takes priority over efficiency.
The speed that is of concern is the surface or peripheral speed of the grinding surface rather than the rpm of the spindle and should that speed fall too low the wheel will not be able to operate efficiently, will become dull more quickly with a greater tendency to clog and the wheel will become hot in use and hot grinding wheels soon become dangerous.
I hope you will be able to see that by reducing the diameter of a grinding wheel by dressing it also reduces the surface speed of the grinding surface even though the spindle speed remains the same. The relationship between surface speed and spindle speed is why small grinding points need to spin at 20,000 rpm and an eight foot wheel at just a few hundred rpm - in both cases the surface speed is similar.

A domestic grinder should not be used for heavy work but as the size of the wheel is reduced it should be used only for increasingly light work and if it is desired to carry out "normal" grinding operations it would be better to replace the wheel sooner rather than later.

Feb 19, 2015 | Craftsman Grinders

1 Answer

Porter cable


DO NOT leave it that way - that fuse is for YOUR protection, and the protection of your family and neighbors.

That humming is probably an byproduct of the speed control, not too much to worry about. The vibration should go away almost entirely when you reset the wheels to run true and dress them to balance.

The capacitor is your starting capacitor - its voltage rating is completely unimportant - that's a max voltage rating, and they only wanted to stock one capacitor, not have one for the 120V versions and a second one for the 240V versions.

Did you by chance start working on this grinder while it was still under warranty?

If the wheels turn freely when the power's off, and if the grinder doesn't get awfully warm when it's in use, then I'd think that the problem is within the speed control board.

Feb 10, 2014 | Grinders

1 Answer

When I turn on grinder, the motor hums but wheels don't turn. I tried to adjust the wheel nuts and finally got the wheels to turn but the motor will stop with just a slight amount of pressure to the...


the drive belt is most likely broke, you can check with the store you got it from ,if they dont have they mite know where you can get one . I hope this helps you .

Feb 03, 2011 | Black & Decker Black Decker 5 In Crimped...

1 Answer

I have a ludell (machine tool) bench grinder. The problem is that the grinder disc will not turn. The motor hums but won't turn. I took the disc off and turned the shaft by hand with the powder on and it...


Ah, the start winding is not operating. When you turn the motor by hand. When the motor speeds up, do you hear a click sound? This is the start winding switch working. There might be a capacitor that is wired in with this switch that is used to start the grinder. If this capacitor is fried, the motor will not start. If the switch is shot, also the motor will not start. There could also be a wire or connector in this part of the motor that is not connected, or fried and not making contact. These are a few things to look for.

Jan 30, 2011 | Grinders

1 Answer

My 6 inch Cummins bench grinder stopped working. When you turn on the switch it only has a quiet hum. Is it the capacitor?


Try wrapping a thin cord around the shaft many times to allow the shaft to be spun in the normal running direction when pulled. Pull sharply on the cord and turn the motor on--if the starting capacitor is bad, the motor should continue to run until shut off. If there is no capacitor, then the motor uses a start winding and a centrifugal switch to start. The switch is supposed to open when the motor comes up to speed. If you used to hear a loud 'click' when the motor was shut off and slowing down, then you likely have the start winding and switch. If the contacts on the switch become burned and not make contact, then it will display the symptoms you mention. You will need to access one or the other end covers to reach the switch. Hope this helps!

Jan 04, 2011 | Delta 23 684 6 Inch Bench Grinder Wheel,...

1 Answer

I have an old 2 piece bench grinder that was wor...


Could be a belt tension issue. Try tensioning the belt by moving the motor and wheels farther apart by reanchoring the units,or,spanning the gap between units with a series of wood blocks and shims(wedges).Be careful with tensioning. Always manualy move the belt,unit unplugged. There should be some deflection(play) in the belt when pressed upon with a finger.

May 20, 2010 | Grinders

2 Answers

I have a Taiwan made 1/2 hp bench grinder that wont run only hums and now it wont even run if I spin it by hand and no capacitor. Is it junk now.


Hi there, with out seeing it I`d say your brushes are gone and ceasing. I hope this solves your problem.

May 18, 2010 | Grinders

1 Answer

I have a Craftsman Commercial 1/2 HP Bench grinder. When I turn it on It just hums. It doesn't turn. Can you tell me what is wrong and which part I need to change? Thank you, Marlan PS: I have misplaced...


The motor has a high spot on the armature causing the motor to stop rotating. The humming noise is the fields full of current which is making the armature to react to make this noise. For the money purchase a new bench grinder which is an easier fix than dumping money into your old one here

May 05, 2010 | Grinders

1 Answer

It hums but won't turn. are there brushes? what is the black canister hooked to wiring going to motor? aloha, chip


Hi Chip , have you tried !!carefully!! turning the grinding wheels whilst the grinder is powered up and humming and does this start the machine , if it does your motor start capacitor ( a cylinder/tube with 2 wires or connectors on it ) will be deffective or the leads might have became detached from it , a replacement capacitor is quite cheap but you must replace it with the exact one ( a motor start/run capacitor of the correct Mfd or uF rating typically 30 uF/Mfd and at the correct voltage 110/220V )
if this dosent fix your problem most likely your motor start windings in the motor field coils are burnt out and the grinder is uneconomical to repair .
hope this helps .

Jan 22, 2010 | Delta Shopmaster 8" Bench Grinder

Not finding what you are looking for?

Open Questions:

Grinders Logo

Related Topics:

535 people viewed this question

Ask a Question

Usually answered in minutes!

Top Craftsman Grinders Experts

Kirk Augustin
Kirk Augustin

Level 3 Expert

2019 Answers

ussick

Level 2 Expert

52 Answers

Lawrence Oravetz

Level 3 Expert

7928 Answers

Are you a Craftsman Grinder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...