[modeleng] Re: Belt tensioner

Hubert,

If I follow your description correctly, then the motor is "pulling down" on 
the front section of the belt between the two pulleys - assuming 
conventional lathe rotation(!). This means that the belt at the back is the 
"slack side".

Here's another way to think of it. Put a chalk mark on the belt, and turn 
the motor by hand in its normal direction. When the chalk mark has gone 
around the motor pulley and is heading back towards the mandrel, that's the 
section of belt to put the tensioner on.

Hope that helps.

JohnP
----- Original Message ----- 
From: "Shep" <shep.28@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, March 29, 2008 11:28 AM
Subject: [modeleng] Belt tensioner


Hi Jeff

Thank for this kind advice.   I am a stupid old man, and am finding it
difficult to follow your instructions.

My set-up is as follows:   The mandrel of the lathe has a  five-groove
poly-vee pulley cut directly into its 20mm diameter.   This is the driven
pulley.

The belt goes down vertically to a motor below the lathe, which has a driver
pulley.   With this set-up, where do I place the tensioning ball-bearings,
which will run on the outside of the belt.

Which is the 'slack side' on this set-up.

Your kind advice will be much appreciated, before I start cutting metal.

Cheers!   Hubert

----- Original Message ----- 
From: "Jeff D" <jeffdayman@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, March 28, 2008 10:44 PM
Subject: [modeleng] Re: Prices


> Hi Shep,
>
> Glad to hear the knee surgery went well.
>
> With regard to your idler, be sure to put it on the loose side of the belt
> run. Between the motor and the driven pulley or pulleys the motor will
> pull
> the belt in tightly. Don't put the idler on one of these tight runs. You
> want your idler on one of the slack runs after the last pulley has been
> driven and before the motor pulley. This is especially true with a back of
> belt idler.
>
> Good luck with it.
>
> Cheers Jeff Dayman Waterloo Ontario Canada
>
> getting warmer but had snow flurries yesterday and still 12" or more of
> snow
> on the ground.
>
>

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