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Old 26th December 2006, 01:25 AM   #1
arnoldc is offline arnoldc  Philippines
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Default Need help on pulley diameter calculation

Hi Guys,

I was able to get my floppy drive motor up and running powered by an old Casio E100 PDA power supply that puts up 5V.

Click the image to open in full size.

It was very competent turning in the Pink Triangle and Clearaudio platters I have on hand.

I wanted to have a local machine shop make a pulley for me.

Having read Mark Kelly's posts about belt creep and all those Poisson formulas, I think I'd avoid a rubber belt and use a casette tape as a belt.

Can someone share the formula I need to use to know the size of the pulley?
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Old 26th December 2006, 01:51 AM   #2
Zen Mod is offline Zen Mod  Serbia
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Default Re: Need help on pulley diameter calculation

Quote:
Originally posted by arnoldc
Hi Guys,

I was able to get my floppy drive motor up and running powered by an old Casio E100 PDA power supply that puts up 5V.


It was very competent turning in the Pink Triangle and Clearaudio platters I have on hand.

I wanted to have a local machine shop make a pulley for me.

Having read Mark Kelly's posts about belt creep and all those Poisson formulas, I think I'd avoid a rubber belt and use a casette tape as a belt.

Can someone share the formula I need to use to know the size of the pulley?


(100/3 x Ddisc )/ Rpm of floppy motor = D pulley

it can't be so easy ........
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Old 26th December 2006, 02:04 AM   #3
arnoldc is offline arnoldc  Philippines
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Wow! That was fast! Is that for a 33 1/3 or 45?

33 1/3 I suppose?

Thanks again Choky, err.. Zen Mod.
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Old 26th December 2006, 02:16 AM   #4
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by arnoldc
Wow! That was fast! Is that for a 33 1/3 or 45?

33 1/3 I suppose?

Thanks again Choky, err.. Zen Mod.

hehe
100/3

not 90/2

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Old 26th December 2006, 02:50 AM   #5
arnoldc is offline arnoldc  Philippines
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Gotcha
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Old 2nd January 2007, 04:27 AM   #6
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Default Stupid question

Sorry,

But I was reading this and are also thinking about putting a TT together.

Little confused over the calculations, Ddisc; is this the diamater of the platter your driving with the motor?

I know i'm a dunce, but i never done this before.


Cheers


Brett
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Old 2nd January 2007, 08:26 AM   #7
diarav is offline diarav  India
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Default Re: Stupid question

Quote:
Originally posted by enzedone

Little confused over the calculations, Ddisc; is this the diamater of the platter your driving with the motor?
Yes, Ddisc is the diameter of the platter.

To make this straight: The diameter is inversely proportional to the RPM.

Motor pulley Dia Dm / Platter Dia Dp = Platter RPM Rp / Motor RPM Rm


Motor pulley Dia Dm = Dp x Rp / Rm

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Din
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Old 2nd January 2007, 05:09 PM   #8
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Default Cheers

I have just calculated mine:


Motor Pulley Diameter Calculation



Platter Diameter = PD

Platter RPM = PRPM

Motor RPM = MRPM

Motor Pulley Diameter = MPD


MPD = PD x PRPM / MRPM = Motor Pulley Diameter


Example: 300 x 33.3 / 250 = 39.96mm

Cheers

Brett
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