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My Newest Dimensions For Dual Pulley For Rega Tables

Hi.Glad to help.Recently I have acquired a few 45rpm records that
I could not play.so I have made a new dual belt pulley that still
includes a single 45 groove for occasional 45rpm playback,so I
will give you those dimensions.I cannot verify this but I believe
this pulley if positioned carefully will still allow the Iron audio
platter to clear the top belt for those of you using one of these.
If you are still using the glass platter you could make a double
pulley of both speeds.

The critical dimensions are the bore of the hole and the depth of
the grooves and there angles.

The bore size of the motor shaft is 3mm or .1181" Do not let the
machinist ream the hole!!!It must be drilled and then bored and the
"V" grooves cut all in one setup for accuracy and concentricity.
The fit of the bored hole is very very important.You would like to
get a very light press fit.Pay your machinist a little more and tell
him to get this right,it,s worth it.
The angle of the "V" grooves is 90degrees.Use a 90deg. grooving tool
ground right to a point.The diameter of the grooves is measured
from this point so it must be sharp.The finished groove diameters
for the two 33 pulleys is .364".The outside diameter before grooving
is .450".If the machinist touches off on this turned diameter the
plunge in depth will be .043" per side.Space the two grooves
approximately .100" measured from the center of the groove.
The turned diameter of the single 45 is .611" and the plunged diameter
is again .043" per side or .525" diameter.This size has not been
confirmed with a speed strobe but I,m pretty sure it,s right.
The 33 sizes I have confirmed for speed.
The total length of my pulley is .380".The distance from the second
33pulley to the 45 pulley is approximately .200.This leaves a small
untouched area for the machinist to grab in the collet so he can
face off the other side when these operations are done.
These dimensions are for a North American version Rega Table.
European Versions require different sizes because of the differing
Hertz frequency and I have not determined those dimensions.
Good Luck and Happy Listening.

Duane Upshaw


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  • My Newest Dimensions For Dual Pulley For Rega Tables - dudeupsh@vaxxine.ca 16:55:53 01/09/05 (0)


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