Author Topic: Triumph 500 twin  (Read 2250 times)

Offline jcge

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Re: Triumph 500 twin
« Reply #30 on: January 18, 2023, 12:50:04 AM »
John - that's truly first class design, machine and finishing work !!
Beautiful !!
Regards
John

Offline Admiral_dk

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Re: Triumph 500 twin
« Reply #31 on: January 18, 2023, 10:41:49 AM »
Progress is progress and the last parts are great  :ThumbsUp:

Per               :cheers:

Offline John Roberts

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Re: Triumph 500 twin
« Reply #32 on: January 18, 2023, 12:37:47 PM »
Many thanks guys for your kind comments.

Offline John Roberts

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Re: Triumph 500 twin
« Reply #33 on: January 19, 2023, 05:04:57 PM »
Photos below show top part of manifold.  Cutters used
 10mm Slot drill (cut out silhouette)
 6mm with  corner rad, to rough out shape
4mm  with corner rad,  to define more detail
3mm ball nose, finish tool path
2mm ball nose, reduce flange fillet
Next job will be to mill the under side, drill holes and wiz out the inside using burrs in a pendent drill.
 

Offline Roger B

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Re: Triumph 500 twin
« Reply #34 on: January 19, 2023, 05:10:10 PM »
Splendid sculpting  :praise2:  :praise2:
Best regards

Roger

Offline Dave Otto

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Re: Triumph 500 twin
« Reply #35 on: January 20, 2023, 12:09:32 AM »
Nice looking part John, it will go well with the rest of your beautiful work.

Dave

Offline John Roberts

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Re: Triumph 500 twin
« Reply #36 on: January 23, 2023, 06:23:18 PM »
Many thanks Dave.
 Underside of intake manifold machined. Inside cavity's cut out, then a shine over to make it look like the original.
Next job, spot through holes into cylinder head and tap 6-32 unf.
After that carburetor to be made. More 3d milling.

Offline Admiral_dk

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Re: Triumph 500 twin
« Reply #37 on: January 23, 2023, 07:41:31 PM »
Great looking Manifold  :ThumbsUp:

But how did you do the internal passage ....  :headscratch:

Per

Offline John Roberts

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Re: Triumph 500 twin
« Reply #38 on: January 23, 2023, 10:11:10 PM »
I machined pockets using ball nose end mill, then drilled at an angle between pockets. A flexi drill and burs were used to create passage through.

Offline ozzie46

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Re: Triumph 500 twin
« Reply #39 on: January 23, 2023, 11:46:04 PM »
what on earth is a" flexi drill"?

Pretty part. Fabulous machining.

Ron

Offline John Roberts

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Re: Triumph 500 twin
« Reply #40 on: January 24, 2023, 11:44:58 AM »
Ron, not a good description. Pendent drill would be its proper name (motor with flexible shaft and collet.)

Offline ozzie46

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Re: Triumph 500 twin
« Reply #41 on: January 24, 2023, 01:19:09 PM »
Ohh I got it, thanks.

Ron

Offline John Roberts

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Re: Triumph 500 twin
« Reply #42 on: January 26, 2023, 06:36:52 PM »
Below photos of carburetor body at various stages of machining.
Special thanks to Mr George Britnell for sharing his design carb with me, which I have adapted to look similar to an Amal concentric which were fitted to British bikes in the 60's and 70's.

Offline Admiral_dk

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Re: Triumph 500 twin
« Reply #43 on: January 26, 2023, 11:06:35 PM »
Looks like a very nice Carburator body  :ThumbsUp:

I do not expect there to be many small bores inside this design (as this came a number of years later in most brands) - so that ought to be do-able too.

Anyway still enjoying the results  :cheers:    :popcorn:

Per

Offline RReid

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Re: Triumph 500 twin
« Reply #44 on: January 27, 2023, 02:31:49 AM »
Now wouldn't that look nice feeding a combustible mixture to my Halfa... :Lol:
Seriously, I do like it very much. :ThumbsUp:
Regards,
Ron

 

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