Re: [CAD_CAM_EDM_DRO] Toothed pully design - Formulae

Oppps...my mistake....your right ...the formula is for the OD of the pulley.
The PD formula would be the same WITHOUT taking away the constant.

Could be the "O" and the "P" keys are to clsoe togheter on the keyboard?
Maybe I type to quick and transpose letters. Or maybe I just don't proof
read enough before hitting the send button?

I think some of them want a drawing of the cutter John. As for me, I don't
need it...got Xcel, a calculator and even a pen and pencil if the electonic
gizmos quit on me.

Have a good day!

Smoke
-----Original Message-----
From: John Stevenson <machines@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Sunday, November 12, 2000 5:14 AM
Subject: [CAD_CAM_EDM_DRO] Toothed pully design - Formulae

>> From: "Smoke" <Smoke@...>
>>Subject: Re: Re: Toothed pully design information needed.
>>
>>Based on what the Browning catalog I have shows, we were right the first
>>time. Number of teeth x pitch per tooth divided by PI - constant = PD.
>>The constant for 3/8" pitch belts is .03, for 1/5" belts
>>it's .02", for 1/2" its .054", for 7/8" its .11" and so on.
>.
>>To get the tooth flange angle I'd suggest doing it like Ian says...get a
>>belt (or a pulley preferably) and measure the angle. That info isn't in

the

>>catalog.
>>
>>Smoke
>
>No -No - bloody - N0 -This whole thread is falling to pieces
>
>It's quite simple. All the info is in present books. There is no need for
>fancy sin, cosine, advanced nuclear physics etc, etc.
>In Smokes example above all the figures are OK EXCEPT he calls the answer
>the PD, -- it's not. It's the OD. The PD is the figure before you take the
>constant off.
>
>Looking at this last night It's very easy to take all this info and put it
>into a very simple spreadsheet.
>
>So that all you need to do is input
>
>[A] The pitch of the belt and
>[B] The number of teeth required
>
>That's all. - What you get out will be:
>
>[1] Outside diameter
>[2] Angle of cutter
>[3] Distance to feed cutter in.
>
>What more do you need ? You don't even need the pitch diameter.
>If somebody can't take a blank , turn it down to a given size, grind a
>simple flycutter up, mount it and feed it into the blank a given distance
>then they should either be buying pulley's or not reading this list.
>
>I can put one together either later tonight or possibly tomorrow night if
>there is a demand for one. Something like an Excel sheet to cover the
>smaller sizes like MP @ 0.080", XL @ 0.200", L @0.375" and H @0.500"
>Would that suit everybody. ??
>
>--
>
>Regards,
>John Stevenson
>Nottingham, England
>
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