Author Topic: Flat twin 60cc  (Read 4228 times)

Offline simplyloco

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Re: Flat twin 60cc
« Reply #15 on: April 08, 2021, 11:30:56 PM »
Quel travail excellent!
J'aime la France!
John

Offline MJM460

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Re: Flat twin 60cc
« Reply #16 on: April 09, 2021, 01:51:04 AM »
Beautiful work, Glorfindel.  It is great to see what young engineers of the future are being taught today.  I do wish you were close enough to run night classes here though.  Though come to think of it, at my age, afternoon might be better.

I am enjoying seeing a quite beautiful engine coming together.  Do you have any pictures of the set ups for holding the various pieces or the machining in progress?  (If it is possible to see the progress past the coolant spray?)

Thanks for posting

MJM460



The more I learn, the more I find that I still have to learn!

Offline glorfindel

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Re: Flat twin 60cc
« Reply #17 on: April 09, 2021, 03:24:35 AM »
Beautiful work, Glorfindel.  It is great to see what young engineers of the future are being taught today.  I do wish you were close enough to run night classes here though.  Though come to think of it, at my age, afternoon might be better.

I am enjoying seeing a quite beautiful engine coming together.  Do you have any pictures of the set ups for holding the various pieces or the machining in progress?  (If it is possible to see the progress past the coolant spray?)

Thanks for posting

MJM460
Thx for the kind words.

I'll put a little bit more details ;-)

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Offline AVTUR

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Re: Flat twin 60cc
« Reply #18 on: April 09, 2021, 02:08:13 PM »
Thanks for the reply.

I will keep on following the postings.

AVTUR
There is no such thing as a stupid question.

Offline glorfindel

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Re: Flat twin 60cc
« Reply #19 on: April 09, 2021, 03:30:27 PM »
So, back plate done!!

Here is the setup. First i did the CAM part with CatiaV5.

Then in used the 3 axis vise and setted the G54 with the probe.

I use 25mm  R390 carbide tool for roughing at 140in/min with a 0.075" depth of cut.

I leave 0.008" for all the finishing passes. I always use a HSS tool for finishing at 15in/min.

Here is 3 shorts videos.

One of roughing with the R390
One of drilling the 8 holes
One of the bearing finishing pass.

Short videos, 'cause i cant let the coolant off for too long, sorry for the quality, the windows are old and dirty.





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Offline glorfindel

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Re: Flat twin 60cc
« Reply #20 on: April 10, 2021, 06:00:22 PM »
All the parts, so far,  with a 3d printed cam box.

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« Last Edit: April 10, 2021, 06:12:36 PM by glorfindel »

Offline Admiral_dk

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Re: Flat twin 60cc
« Reply #21 on: April 10, 2021, 07:58:24 PM »
Looks like it will be a very elegant engine when you finish it  :cheers:

I will not envy you your access to such nice tools - but I will admit that I would like have that too ...!

Per

Offline glorfindel

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Re: Flat twin 60cc
« Reply #22 on: April 10, 2021, 08:06:48 PM »
Looks like it will be a very elegant engine when you finish it  :cheers:

I will not envy you your access to such nice tools - but I will admit that I would like have that too ...!

Per
Thx.

I have decided to start an "engine builder club" at school next year, i need practice ;-)

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Offline AVTUR

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Re: Flat twin 60cc
« Reply #23 on: April 11, 2021, 12:11:20 PM »


I have decided to start an "engine builder club" at school next year, i need practice ;-)

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Does that mean you will have many helpers? Or distractions?

AVTUR
There is no such thing as a stupid question.

Offline MJM460

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Re: Flat twin 60cc
« Reply #24 on: April 11, 2021, 01:28:47 PM »
Hi Glorfindel, thanks so much for posting those clips. (Short is good!)  It is most interesting to see a little of how those complex parts are produced. 

I sure wish that a club like that was available when I was studying.  I suspect it will be popular.

MJM460


The more I learn, the more I find that I still have to learn!

Offline Art K

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Re: Flat twin 60cc
« Reply #25 on: April 11, 2021, 11:49:49 PM »
Glorfindel,
I have been following along not commented till now, I have a lull in the busyness. I like the flat twin, interesting use of scissor rods to do the cylinders in line. Some of the old V12'sused that set up.
Art
"The beautiful thing about learning is that no one can take it away from you" B.B. King

Offline glorfindel

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Re: Flat twin 60cc
« Reply #26 on: April 12, 2021, 12:05:58 AM »
Glorfindel,
I have been following along not commented till now, I have a lull in the busyness. I like the flat twin, interesting use of scissor rods to do the cylinders in line. Some of the old V12'sused that set up.
Art
Both rods weight the same, CAD is usefull in those situations.

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Offline glorfindel

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Re: Flat twin 60cc
« Reply #27 on: April 13, 2021, 03:26:01 PM »
Cutted the cams this morning. I cnc a bar and slice it with the wire edm.

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Offline glorfindel

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Re: Flat twin 60cc
« Reply #28 on: April 14, 2021, 05:29:30 PM »
I did the rear crank today, 2 setups. The last one ( chuck in a vise) is not "standard"... ;-)



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Offline glorfindel

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Re: Flat twin 60cc
« Reply #29 on: April 24, 2021, 05:21:04 PM »
Hi guys.

Did the "front crank" the oldchool way but did the web on the cnc ;-)

Then came the moment of truth, when you put ewrything together, crank wise  and make it turn for the first time by hand...It turned pretty smoothly!! So everything is aligned!!

Did the cambox too, i let the "floor" a little bit thicker that what i calculate to be sure to match the lenght of the timing belt without using a bender.

Finaly, i did the pistons. My bore is 1.3767" and my pistons are at 1.374"

Tried to do the master rod...did go well, finish was horrible and i had an offset in my bushings.

Will work on that Monday.

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