Author Topic: GDB Inline 4 Cylinder OHV I.C.  (Read 2549 times)

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #30 on: September 06, 2018, 11:34:40 PM »
Thanks Eric.  Maybe a shoe box to transport this one.

-Bob
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #31 on: September 06, 2018, 11:41:37 PM »
Block continued-

The tangent points of the two internal radii needed to be milled in a straight line along with the outside of the wall. In order to align the radii, two ball bearings and tool blank were used.  This worked well and the tangents were sucessfully blended.  Next the outside of the wall was milled. 

-Bob
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Offline zeeprogrammer

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #32 on: September 07, 2018, 12:13:21 AM »
Neat!
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline b.lindsey

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #33 on: September 07, 2018, 12:57:26 AM »
Yeah, neat trick Bob. Have to file that one away.

Bill

Online Dave Otto

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #34 on: September 07, 2018, 01:13:50 AM »
Nicely done Bob!

Dave

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #35 on: September 07, 2018, 02:07:28 AM »
As always, thank you gentlemen for your support. 

I posted the bearing trick in "Tip and Tricks" with a writeup.

-Bob
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Offline Roger B

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #36 on: September 07, 2018, 08:45:48 AM »
Off to a great start  :ThumbsUp:  :ThumbsUp:  :wine1:
Best regards

Roger

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #37 on: September 09, 2018, 04:27:52 PM »
Block continued-

The timing case feature is now complete, sans the threaded holes for the cover and some additional handwork.  The .062 radius on the outside back edge was done with a lathe tool that was mounted in a fly cutter.  The spindle was locked in position and the Rotary Table was cranked and acted like a Planar with the tool being fed in small increments.  This allowed the cutter to cut right up to the corners without trailing away as would happen if the tool was turning in the spindle. 

The outside of the small radius for the wall, which was machined in the above post were the tangent was milled, was done in a similar fashion.  The boring bar was mounted 180 degrees out from normal as if to cut an od with the boring head.  The boring head was carefully turned back and forth by hand.  After each cut, Z was increased .010 and the motion was repeated until the depth of the wall was fully cut.

-Bob
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #38 on: September 09, 2018, 04:28:52 PM »
Thanks Roger for your support.

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

Offline b.lindsey

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #39 on: September 09, 2018, 06:57:52 PM »
Good to see you getting some shop time Bob. The block is coming along well.

Bill

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #40 on: September 17, 2018, 03:18:12 AM »
As always Bill, thank you for following along.

For a couple of different reasons I put the block on hold.  My allergies have been bad and the block requires more concentration than I am able to muster at this point.  Secondly, I have the Rivett 608 up on blocks incase the basement floods as Florence moves this way.  I was planning on boring the cam tunnel next and was going to set it up on the Rivett with an angle plate bolted to the faceplate. 



Crankcase breather-

In order to keep this build moving, I picked off a part that I could get through with my allergy situation.  I started the crankcase breather assembly by making the flange.  I started with a piece of .750 diameter aluminum and roughed out a blank.   The blank was then mounted to the .187 dia. expanding collet that I used for the flywheels in the "Tiny I.C." build.  The collet was used to face the back of the blank and was then transfered to a Vee Block, which was setup on the Rotary table.  The bolt holes were drilled along with one hole into the collet that allowed the blank to be pinned to help prevent it from moving during milling. The basic profile for the flange was then milled.  The smaller radii were filed by hand.

-Bob
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Offline Art K

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #41 on: September 17, 2018, 04:03:44 AM »
Bob,
Just in case I haven't chimed in yet I wanted to let you know that I'm following along. I have a great respect for George and it is great to start to see people building his designs. Great work so far.
Art









Offline Kim

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #42 on: September 17, 2018, 05:48:29 AM »
Nice little part there, Bob.
Sorry about the allergy situation.  That's no fun at all. Hope it gets better soon!
Kim

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #43 on: September 17, 2018, 10:49:42 PM »
Thanks Art for following along as well as your kind compliment.

Thanks Kim.  Yeah, allergies are not fun at all.  I try very hard not to take anything for them and usually they clear up within a day or two on their own.  The fall is a particularly bad time for me. 

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

Offline zeeprogrammer

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #44 on: September 17, 2018, 11:41:16 PM »
 :popcorn: Following along.

Try not to sneeze in the shop. Those small parts will fly.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.