Author Topic: GDB Inline 4 Cylinder OHV I.C.  (Read 16666 times)

Offline MJM460

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #135 on: April 05, 2021, 04:08:22 AM »
Hi Bob, that looks like a good secure way to machine the faces square.

I am another who reads every post and would be most interested two see how you did those more complex parts.

MJM460
The more I learn, the more I find that I still have to learn!

Offline fumopuc

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #136 on: April 05, 2021, 07:42:37 AM »
Hi Bob, I have been a very long time familiar with this time issue between, life, work and shop time.
So I do understand your situation very well.
But for me it doesn´t matter if it is a long term or a short term project to watch.
Your project itself is very interesting and I do read every post with pleasure.
 


Kind Regards
Achim

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #137 on: April 05, 2021, 11:03:18 AM »
MJM and Achim thank you both for expressing your interest in further posts.

-Bob
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #138 on: April 05, 2021, 11:27:18 AM »
Rear Main Cap-

This was a “fun” part to make.  I goofed a couple along the way. 

A one inch bar was placed in a collet in the Rivett 608.  A register was turned for future indicating.  The cap requires a .275 radius; so, a .550 diameter was turned.  A .250 diameter bore was also turned at the same time.  The dividing head was setup in the Clausing 8520 and the bar placed in the chuck.  The register was checked and the milling started. 

Five axis is a big buzz word in the cnc world.  This is a manual five axis setup.  A .375 endmill was used to mill away half of .550 diameter establishing the required .275 radius.  Next, the part was indexed and both the sides and width were milled..

-Bob
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #139 on: April 06, 2021, 11:33:51 AM »
Rear Main Cap continued-

The mounting holes were drilled and the height of the pads were milled.  Next the profiling of the .275 radius was done with a small endmill by taking light cuts and indexing by hand.  Once the radius was completed, the dividing head was set to 45 degrees and the side of the pad was milled.

-Bob
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #140 on: April 10, 2021, 11:13:45 PM »
Rear Main Cap continued-

The Main Cap was then sawn from the parent bar.  It was then placed on the same fixture as the other caps in the Atlas 618 and faced to size.  Next came some light handwork with sandpaper and Scotchbright.

I included a picture of the completed Main Cap flanked by two screwups.

-Bob
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Offline Don1966

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #141 on: April 10, 2021, 11:27:32 PM »
Bob I would say it’s a long time coming but hey buddy your getting there all great work.... :Love:



 :cheers:
Don

Offline Art K

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #142 on: April 11, 2021, 03:16:29 AM »
Bob,
Great progress on the engine. Had to play catch up, life is in the way. I liked the process you used to make the rod caps, Have to file that away for future reference.
Art
« Last Edit: April 11, 2021, 11:24:10 PM by Art K »
"The beautiful thing about learning is that no one can take it away from you" B.B. King

Offline Admiral_dk

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #143 on: April 11, 2021, 12:30:59 PM »
Except from the screws it looks exactly like a full size engine  :praise2:

Can you get matching bolts or are you forced to do those yourself ?

Per

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #144 on: April 11, 2021, 05:15:55 PM »
Don thanks for still tuning in.

Art thank you and I’m happy that you have filed that process away for future reference.  That has always been my hope that people find some useful nugget from these posts.

Per, I usually windup making the bolts because it is the only way to get the correct look.  However, I have a few small socket head cap screws that I have used to hold the oil pan and timing cover on.  I really like the look that they provide and McMaster Carr sells them from 0-80 and up in different lengths. 

-Bob

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Offline steamer

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #145 on: April 12, 2021, 02:32:27 AM »
Thats a fine looking block!....Coming along great Bob

Dave
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Offline Dave Otto

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Re: GDB Inline 4 Cylinder OHV I.C.l
« Reply #146 on: April 12, 2021, 02:50:57 AM »
Beautiful work Bob!
Great to see you posting again.

Dave

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #147 on: April 12, 2021, 11:54:44 PM »
Dave and Dave thank you both for checking in.

-Bob
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #148 on: April 24, 2021, 12:05:34 AM »
Oil Pan-

A parallel was indicated and clamped to the Benchmaster’s table.  The aluminum blank was banked against it.  Two J&S clamps were used to secure the blank to the table and two toe clamps were used as stops as an insurance policy.  The pocket was then roughed out.


-Bob
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http://www.youtube.com/user/Notch90usa/videos

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #149 on: May 04, 2021, 03:25:48 AM »
Oil Pan continued-

The pan required a five degree angle for the side walls.  The head on the Clausing was set to five degrees and both inside walls were milled.  The pan was then moved back to the Benchmaster and a long reach endmill was used to rough the sides and the lips.

-Bob
Proud Member of MEM

My Engine Videos on YouTube-
http://www.youtube.com/user/Notch90usa/videos