Does anybody out there happen to know the angle of the taper that the alternator drive pulley fits on? Expressed either as an angle or 1 : ?. I don't mind which although the former would save me the maths!
I need to make a special pulley for the project and don't believe that I'll be able to use/modify a standard pulley as the material is too thin for my purposes.
Crankshaft Pulley Taper Angle
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howardjs
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Re: Crankshaft Pulley Taper Angle
Here is a drawing of a 2CV crankshaft alternator drive pulley I intended to make for HJS1. It sets the belt and alternator back 23mm. It never got made as I eventually made do with the original with the fan flange removed. It also incorporates 3 tapped holes for an extractor.
At the time I measured the taper many times and kept coming out with 10.7deg then 10.84deg. then 10.96deg..!! so I eventually put 11deg on the drawing with the intension of turning a little undersize the easing out if needed until I got an exact fit. It would mean keep taking the pulley out of the lathe unless you happen to have a spare crankshaft knocking about..!
Hope this helps
Howard
At the time I measured the taper many times and kept coming out with 10.7deg then 10.84deg. then 10.96deg..!! so I eventually put 11deg on the drawing with the intension of turning a little undersize the easing out if needed until I got an exact fit. It would mean keep taking the pulley out of the lathe unless you happen to have a spare crankshaft knocking about..!
Hope this helps
Howard
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- 2CV crankshaft pulley with 23mm set back
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hutchii
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Re: Crankshaft Pulley Taper Angle
Howard,
Thanks for the info.
Interestingly the company I used to work for made Diesel injection rotary pumps. I got a colleague to check their taper. 11deg 30mins +/-10mins, albeit a different reference diameter, so that looks about right. I have considered setting up the compound slide by mounting an existing pulley into the chuck and clocking the bore 'til it's zero throughout the length, but thought this a lengthy process as concentricity would need to be perfect too.
As a matter of interest, I modded my 223 pulley a long time ago by fitting a hollow plug into the starting handle hole, and using an M10 Caphead to replace the standard bolt. Now, if the pulley needs to be removed, an 8mm Allen key fits through the hole and the outer end of the head hits the back of the plug while the bolt is still engaged, thus jacking the male off the female taper. So much easier than bashing a socket to try and break the fit. Works a treat!
Thanks for the info.
Interestingly the company I used to work for made Diesel injection rotary pumps. I got a colleague to check their taper. 11deg 30mins +/-10mins, albeit a different reference diameter, so that looks about right. I have considered setting up the compound slide by mounting an existing pulley into the chuck and clocking the bore 'til it's zero throughout the length, but thought this a lengthy process as concentricity would need to be perfect too.
As a matter of interest, I modded my 223 pulley a long time ago by fitting a hollow plug into the starting handle hole, and using an M10 Caphead to replace the standard bolt. Now, if the pulley needs to be removed, an 8mm Allen key fits through the hole and the outer end of the head hits the back of the plug while the bolt is still engaged, thus jacking the male off the female taper. So much easier than bashing a socket to try and break the fit. Works a treat!