[HorridHenry]

I have two 750w B&D routers which I don't use now as I have an Ryobi 1500w.

Anyway these B&D routers are similair in body shape to those Kress router/drill.

When under load these tend to be a bit noisy and was pondering whether it be the plastic casing they're housed in? so it got me thinking about sandcasting a round body in aluminium and house it in this,plus better bearings to suit the armature shaft.

Anyone think that an aluminium body would dampen the noise a bit bearing in mind the thickness of the wall of the housing will be about 3mm or 4mm

[HorridHenry]

This is the fella,the body can detach from the base.

[Christian Knüll]

Changing the casing won't help - the noisy part is the fan.
To improve noise you need to get rid of the fan without killing the spindle due to overheating. You may think about attaching a silent blower on the outside with a duct leading to the venting holes - however this will look quite a bit strange.

[Al_The_Man]

To improve noise you need to get rid of the fan without killing the spindle due to overheating..

Your rpm may go way up, the off load rpm is restricted by friction and windage only, the Universal motor operates in a run away condition.
Al.

[HorridHenry]

Forgot about this thread....

Anyway the KW800 doesn't have a blower fan....
Black & Decker KW800 Type 1 Router Spare Parts | Miles Tool & Machinery Centre

I'm guessing that the plastic body and possibly the bearings are the suspect of noise?

[HorridHenry]

Your rpm may go way up

It has a speed controller on the top,Al

[Christian Knüll]

the fan is directly below the rotor:


I don't know about the B&D but a Kress won't run away with removed fan - they have closed loop speed control.

[Al_The_Man]

It has a speed controller on the top,Al

Yes but the maximum rpm would still go up, the built in speed controllers do not offer great control, you would need something like SuperPID for that.
It would be unusual if there were not an internal fan blade on the armature itself.
It is a similar to covering the output of a vacuum, you are essentially removing the fan from the load and the RPM can be heard to rise drastically.
Al.

[HorridHenry]

How quiet are treadmill motors? I been given one and pick it up tomorrow.

I know they're 180v not too sure if thats DC or AC? this ones 1.7hp which is decent for a spindle.

[HorridHenry]

How quiet are treadmill motors?

Pretty quiet than the afore mentioned router.
They're quite heavy and weigh around about 8kg but thats down to the iron flywheel housing that takes the treadmill belt drive,once this is removed off the shaft spline it becomes less weight and is adequate for a CNC spindle or a better mini-lathe motor.

[keebler303]

The treadmill motor is only turning a few thousand RPM with substantial torque while the router is much higher speed with substantially less torque. To put them in the same class, you could gear up the treadmill motor with belts and pullies, but then you have to have a spindle with its own bearings.

Matt

[HorridHenry]

To put them in the same class

Hi,Matt
I knew the treadmill motor is only 4200rpm opposed to the router at 28000rpm?

The intended thing was to drive a spindle on a pully as you stated.

I got it for nothing so will not lose out and so its either use on the lathe or CNC whichever suits the motor better?

[Al_The_Man]

How quiet are treadmill motors? I been given one and pick it up tomorrow.

I know they're 180v not too sure if thats DC or AC? this ones 1.7hp which is decent for a spindle.

The vast majority are DC, although I have seen a Universal motor with rpm/tach control on one, one thing to watch out for is some have offset brushes making them uni-directional, usually the cheaper ones.
The KB/Baldor drives on ebay are a good candidate for a drive.
Be suspicious of HP claims, they often would not run at the rated hp in a sustained mode.
Al.

[SPEEDRE]

I have found that using a router for sustained usage will burn it out relatively quickly. Yes they are ungodly noisome. I have a treadmill motor and a variable controller from Supluscenter.com, but its weight has made some build/strength issues in the past. If you don't mind over building your machine it gets my vote for a quieter cooler machine.

[Wombilly]

Most noise from spindle motors is down to balancing, if the spindle and tool is perfectly balanced, including the collet nut, then noise should be to a minimum,