Author Topic: Oh, what the hey!  (Read 701 times)

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Offline connieklr

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Oh, what the hey!
« on: August 15, 2019, 06:58:52 pm »
Let’s modify a Triumph Trident rear sprocket to work on an “ancient” late ‘40s Velocette rear hub.



The piece you see in the mill is a stepped slug I turned to insure the rotary table is dead center with the quill once the end mill is inserted.

Still in the layout stage, and hope to have everything centered up and concentric so I can make some chips before the w/e. Basically, one shot at this, so keeping fingers crossed.


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Offline Mcfly

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Re: Oh, what the hey!
« Reply #1 on: August 15, 2019, 09:31:06 pm »
Wow Guy, I'm guessin' that '40's sprocket is either really expensive, or no longer in made?

Good luck!!
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Re: Oh, what the hey!
« Reply #2 on: August 15, 2019, 10:32:48 pm »
oh boy... that's a "big'n", 48 tooth?, I think you can get KZ' sprock's in that still.. I might have one, from back in my "MR. Riceburner Ent./ drag racing days"....    :rotflmao: :rotflmao: :rotflmao: :rotflmao:

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Offline connie_rider

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Re: Oh, what the hey!
« Reply #3 on: August 16, 2019, 12:30:43 am »
So, what modification are you going to make?

Ride safe, Ted
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Offline connieklr

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Re: Oh, what the hey!
« Reply #4 on: August 16, 2019, 11:08:12 am »
So, what modification are you going to make?

Ride safe, Ted

Milling out the center, and cutting a relief to fit the hub + drilling holes for bolts that secure the two together.

EDIT: A couple of pix..........

The sprocket on the right is the original. And no, I did not count the teeth. The one on the left is a previously modified one done by another a year or so ago at a local machine shop. That fella has since passed, which is why I've been given the opportunity to modify another (the owner has two (2) Velocettes.


The object on the left is the hub from one of the bikes. It's a combination sprocket carrier and brake drum. The sprocket on the right is the sprocket mentioned above with an approximation of how large the original center hole was prior to opening it up. The step relief will also need cut in the sprocket I'm working on now.


Both the sprockets are shown inverted from how they'll be bolted to the hub.
« Last Edit: August 16, 2019, 11:57:35 am by connieklr »
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Offline connie_rider

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Re: Oh, what the hey!
« Reply #5 on: August 16, 2019, 12:20:51 pm »
I follow ya.
But don't see how your gonna mill it out {as it is clamped}?

I did a similar project and cut the ID on a Lathe, then clamped in place to drill the holes.

Ride safe, Ted
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Offline m in sc

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Re: Oh, what the hey!
« Reply #6 on: August 16, 2019, 01:52:01 pm »
i've done similar as well. lat time i made a fixture plate and bolted the sprocket to it to mount on the rotary table. i was using blank sprockets a s a start.

as an fyi, look up 'rebel gears' they probably can produce these, especially if you give them a sample or just dimensions. .

Offline connieklr

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Re: Oh, what the hey!
« Reply #7 on: August 16, 2019, 02:08:51 pm »
i've done similar as well. lat time i made a fixture plate and bolted the sprocket to it to mount on the rotary table. i was using blank sprockets a s a start.

as an fyi, look up 'rebel gears' they probably can produce these, especially if you give them a sample or just dimensions. .

I'll pass the name along to the owner.

Thank you.
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Offline connieklr

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Re: Oh, what the hey!
« Reply #8 on: August 16, 2019, 02:13:32 pm »
I follow ya.
But don't see how your gonna mill it out {as it is clamped}?

I did a similar project and cut the ID on a Lathe, then clamped in place to drill the holes.

Ride safe, Ted

Going to be done in stages, and still working out the final details in my head.

As far as using a lathe, the swing on mine can't accommodate the diameter of the sprocket I'm working on.
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Offline connieklr

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Re: Oh, what the hey!
« Reply #9 on: August 17, 2019, 02:52:32 pm »
Wow Guy, I'm guessin' that '40's sprocket is either really expensive, or no longer in made?

Good luck!!

No longer made.

I did decide to count the teeth on it – 60T. It came from an off-road competition bike and the owner wants to convert it for limited street use. The 60T is not a good choice fo that - obviously.

The original modified sprocket was a 52T for something from England, and the one I’m getting ready to whack on is a 53T from a Triumph Trident. Fortunately, he’s in no big hurry, but I would still like to get it taken care of as soon as I can.
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Offline connie_rider

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Re: Oh, what the hey!
« Reply #10 on: August 19, 2019, 11:43:43 pm »
We'll be watchin..

Ride safe, Ted
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Offline connieklr

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Re: Oh, what the hey!
« Reply #11 on: August 20, 2019, 02:41:29 pm »
We'll be watchin..

Ride safe, Ted

I'm sure you will.......   :rotflmao:   
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Offline connieklr

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Re: Oh, what the hey!
« Reply #12 on: August 31, 2019, 11:31:53 pm »
Almost there. Just have a little de-burring and I can turn it over to the customer.

Wound up having to make a holding fixture, the clamps wouldn't grip the sprocket tight enough and it wanted to shift. To complicate matters, the dang thing was warped slightly so it wouldn't sit flat on the table(s). Made the fixture out of 3/4" MDF. It ain't pretty, but it seemed to do the trick. Made the last cuts this evening, and glad to get this one out of my hair.








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Offline connie_rider

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Re: Oh, what the hey!
« Reply #13 on: August 31, 2019, 11:46:02 pm »
I'm impressed!

Ride safe, Ted
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Offline Diz

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Re: Oh, what the hey!
« Reply #14 on: September 01, 2019, 08:01:59 am »
+1  :great:

Offline Lee

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Re: Oh, what the hey!
« Reply #15 on: September 01, 2019, 09:43:43 am »
Exceptional work! Nice just not do it justice. Neat might tough.......

Offline connieklr

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Re: Oh, what the hey!
« Reply #16 on: September 12, 2019, 04:07:02 pm »
Gone. The customer picked it up this morning. Seemed pleased, as am I for the rewards.... from a bux and experience standpoint.



Note: Ballos is a local machine shop that did the original sprocket. They've done cylinder boring work for me in the past. They do good work, but I have met a couple of folks whose projects are now in limbo due to their head machinist passing away suddenly about 6 mos. ago. No way in Hades could I fill that void, but if I can pick up something every now and again that I think I can handle, we'll give it a go.
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Offline Sailor Rich

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Re: Oh, what the hey!
« Reply #17 on: September 12, 2019, 09:43:14 pm »
Well done!

Offline connie_rider

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Re: Oh, what the hey!
« Reply #18 on: September 13, 2019, 12:05:36 pm »
I really hate to admit this,,, but, I gotta say,,, Ya did good.
            "Exceptionally well done" Buddy!

Ride safe, Ted
14 Connie (Traveler II) / 03 Connie (Buddy)
Gone but not forgotten; 87 and 00 Connies..

If your not already a COGger, "consider becoming one".
Help us make "OtP" possible again!!