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SA GH6 dynohub axle replacement
gentlemen,
i need to replace the axle on a second-hand GH6 front wheel dynohub. production date is 1966. Wrong nuts were used on this hub by a previous owner - unfortunately i have no way of measuring the threading, as it is almost completely gone. could someone tell me the correct threading? i do have a box full of various SA hubs, is there any chance i could use an axle out of another (non-dynohub) SA hub? (perhaps the front internal brake hubs used the same axles?) i checked some old SA manuals but the ID-codes for the axles do not match - but then again the axles are not the same length, etc. any pointing me in any direction would be grately appreciated thank you, gregory |
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#2
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SA GH6 Dynohub axle replacement
Gregory Raye writes:
I need to replace the axle on a second-hand GH6 front wheel Dynohub. production date is 1966. Wrong nuts were used on this hub by a previous owner - unfortunately I have no way of measuring the threading, as it is almost completely gone. Could someone tell me the correct threading? 3/8-24TPI I do have a box full of various SA hubs, is there any chance i could use an axle out of another (non-Dynohub) SA hub? (perhaps the front internal brake hubs used the same axles?) I checked some old SA manuals but the ID-codes for the axles do not match - but then again the axles are not the same length, etc. One important feature is to heed the cryptic instruction on the hub that says: "Do not remove without keeper" No one that I know has a keeper but just the same DO NOT TAKE TH STATOR OUT OF THE HUB or better said do not take the stator out of the magnet or it will be permanently demagnetized... instantaneously. This is an ALNICO magnet that cannot retain its magnetism outside of a closed magnetic circuit. Once separated, the Dynohub will produce about half its designed voltage... that isn't much anyway. I built a magnetizer and discovered that this archaic design isn't worth rebuilding. There are good ones on the market today. Jobst Brandt |
#3
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SA GH6 Dynohub axle replacement
thank you Jobst for the information.
i am aware that there are new dynohubs today, but would still like to fix the SA hub, as (except the axle) it is working well. i had a look at the hub and i think it should be possible to get the axle out of the hub without removing the magnet - is this correct? greetings, gregory |
#4
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SA GH6 dynohub axle replacement
gregory wrote:
gentlemen, i need to replace the axle on a second-hand GH6 front wheel dynohub. production date is 1966. Wrong nuts were used on this hub by a previous owner - unfortunately i have no way of measuring the threading, as it is almost completely gone. could someone tell me the correct threading? i do have a box full of various SA hubs, is there any chance i could use an axle out of another (non-dynohub) SA hub? (perhaps the front internal brake hubs used the same axles?) i checked some old SA manuals but the ID-codes for the axles do not match - but then again the axles are not the same length, etc. any pointing me in any direction would be grately appreciated www.hadland.net for all SA information,as in: http://www.users.globalnet.co.uk/~ha...samaintind.htm http://www.users.globalnet.co.uk/%7ehadland/gill.html --- Marten Gerritsen INFOapestaartjeM-GINEERINGpuntNL www.m-gineering.nl |
#5
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SA GH6 Dynohub axle replacement
Gregory rayee? writes:
I am aware that there are new dynohubs today, but would still like to fix the SA hub, as (except the axle) it is working well. I had a look at the hub and I think it should be possible to get the axle out of the hub without removing the magnet - is this correct? In fact you can even take the magnet out of the hub if you make sure it remains ON the stator. The magnet has a paper backing so that it won't rattle. Just make sure the stator and magnet are not separated. Unfortunately there are no call-outs pointing at the various components on the SA drawing: http://www.users.globalnet.co.uk/~hadland/sa/sagh6.pdf but the ring around the magnet in the drawing is paper. Of course, no "keeper" is shown although, as always, it is mentioned. I've never seen one other than the solid iron block I made to measure the field strength before and after magnetizing. Other than that, the magnet had to be carefully pushed from the magnetizer core onto the stator with no slip-ups. Jobst Brandt |
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