Need help on pulley diameter calculation

arnoldc · 26th December 2006, 01:25 AM

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?

Zen Mod · 26th December 2006, 01:51 AM

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 ........

arnoldc · 26th December 2006, 02:04 AM

Wow! That was fast! Is that for a 33 1/3 or 45?

33 1/3 I suppose?

Thanks again Choky, err.. Zen Mod.

Zen Mod · 26th December 2006, 02:16 AM

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

arnoldc · 26th December 2006, 02:50 AM

Gotcha

enzedone · 2nd January 2007, 04:27 AM

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

diarav · 2nd January 2007, 08:26 AM

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

Regards
Din

enzedone · 2nd January 2007, 05:09 PM

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

26th December 2006, 01:25 AM	#1
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	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. 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?

2nd January 2007, 04:27 AM	#6
enzedone diyAudio Member Join Date: Nov 2004 Location: New Zealand	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 __________________ I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX.

2nd January 2007, 05:09 PM	#8
enzedone diyAudio Member Join Date: Nov 2004 Location: New Zealand	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 __________________ I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX.

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26th December 2006, 02:04 AM	#3
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	Wow! That was fast! Is that for a 33 1/3 or 45? 33 1/3 I suppose? Thanks again Choky, err.. Zen Mod.

26th December 2006, 02:50 AM	#5
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	Gotcha

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