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Home Workshop > General Area > General > Gear change shaft splines 60s Ducati

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Gear change shaft splines 60s Ducati

Gear change shaft splines 60s Ducati

Wonder if anyone knows how I might go about identifying what splines used on 1960s Ducati gear change shaft? Need to get some gear levers wire cut (unless anyone has a broach?) and it would be a great help if it were possible to identify the splines which would mean getting a drawing done would be much easier.

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Chris Stevens
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Re: Gear change shaft splines 60s Ducati

Unless someone who actually knows chimes in, start by taking a picture of the end of the shaft with a digital or decent smart phone camera .  Transfer to the computer, blow it up and copy into a CAD program.  Its unlikely to be anything other than straight sided or involute form, probably truncated tho', so tracing over or playing about with magnification of the gear insertion routine should give you a very good idea of what it could be.  Then its down to checking the books as a sanity check.

Tedious old process but it does work.  Did that for gearbox output splines on a pre 1910 bike.  Frankly the hardest part was finding documentation as to what they actually were as the measured results were clearly a touch out.

Clive

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Clive Foster
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Re: Gear change shaft splines 60s Ducati

I take it we are talking about Ducati bevel singles ?  First we need to know what model, year, CC,  Narrow case, Wide case,  4 speed, 5 speed, then I might be able to help, gear box shafts for the various units come up on fleabay for not a lot, from time to time.
Just finished rebuilding a 1962 250cc  Ducati  Daytona, 4 speed, Narrow Case.  Starting work on my 350cc Narrow Case 5 speed Racer, the box is appart at the moment, but it's a close ratio box but the shafts might be the same that you are enquiring about..
Regards,    Vic..

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Victor Scott
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Re: Gear change shaft splines 60s Ducati

Thanks very much for your advice Clive, I can see that should work well. Victor the motor is a 160 Monza Junior. The gear change splines seem to be exactly the same as those on the narrow case 250 I have as well? Thats useful and will mean the levers will fit both motors. Dont suppose yoiu know anything about narrow case 175s?

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Re: Gear change shaft splines 60s Ducati

Some years ago I had the problem to solve the other way round for my 900GTS; I wanted to make a stainless cross shaft to fit my existing gear lever .
I cut the splines on some stainless bar in the Myford, using an indexed gear train on the changewheels. I can't remember now, but I think it may have been 22 splines, but it was 10+ years ago.
Splines were cut using a modified screwcutting tool, mounted horizontally in the toolpost. I removed the topslide screw and endplate and substituted a pivoted lever arrangement.
The shaft is still doing its job, so it occurs to me that if you did a similar reproduction, but using tool steel, it wouldn't take a great deal of modification to turn it into a broach.
I wish I'd made a blank myself now, as I could do with making'converting a spare gear lever myself.

All the best
Bill

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Bill Williams
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Re: Gear change shaft splines 60s Ducati

Thanks Bill, sounds a very effective way of making a splined shaft. Sorted now though as Disco Volante do a splined cotter fitting for use with rear sets that can simply be welded onto the alloy gear levers I have already. This is only for a few levers so the weld method will be fine.

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