Author Topic: GDB Inline 4 Cylinder OHV I.C.  (Read 3190 times)

Offline Dave Otto

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #15 on: August 21, 2018, 12:27:16 AM »
Hey Bob,
Looking forward to following along with your new project.


Dave

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #16 on: August 21, 2018, 11:39:40 AM »
Achim, Jack and Dave, thank you for joining in.  It's going to be a long ride.

-Bob
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #17 on: August 26, 2018, 04:16:19 PM »
Engine Block continued:

Unfortunately, I didn't get any shop time this past week.  Yesterday, I was able to get a little time in and did some layout work for the next machining operation.  I am hoping to get some time in this afternoon to actually do some machining.

As far as the layout goes, I thought I'd post a picture of my Brown and Sharpe 570 vernier caliper in action.  It is an old vernier that I picked up that has two holes in it that are for setting dividers.  It provides an easy way to set an accurate radius for layout work.  I usually don't do layout work and just machine off of the dials from datums.  For this particular venture, I have the layout lines to serve as a check and balance to hopefully prevent a machining blunder.
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Offline gbritnell

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #18 on: August 26, 2018, 06:05:35 PM »
HI Bob,
Even though I have digitals on my machine I always give myself layout lines for reference.
gbritnell
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #19 on: August 28, 2018, 08:53:44 PM »
George they are a big help with the intricacies of this part.

I literally got called into work Sunday right when I was about to go into my shop.  I was able to get in the shop a little Sunday night and installed a toolmaker's button.  The button will allow me to indicate accurately on the rotary table to mill the pocket for the timing gears.

-Bob
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #20 on: September 03, 2018, 10:11:36 PM »
Engine Block continued-

After the layout, the block was tapped 5-40 and a Toolmaker's Button was installed.  The Button was then carefully moved into position.  The Engine Block was then setup on an angle plate and mounted to the Rotary Table.  The Button was then indicated true to the Rotary Table; finally, the RT was indicated to the spindle.  Then it has just been a lot of cranking of the handles and whittling away at the aluminum.  This feature is probably about 90% finished.

-Bob
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Online b.lindsey

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #21 on: September 03, 2018, 10:28:36 PM »
Looking great Bob. Glad you are finding some shop time.

Bill

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #22 on: September 03, 2018, 10:32:52 PM »
Thanks Bill.  Thank goodness for this long weekend.  We had a wedding on Long Island that chewed up most of it.  Luckily I was able to get in the shop this morning and machine what I posted above.  Now I need to get off of this computer and get back at it.

-Bob
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Offline zeeprogrammer

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #23 on: September 03, 2018, 10:54:12 PM »
I got really confused by the photo of engine block.
I don't recall your posting a picture of the project and my googling left me even more confused.

Can you point me to a picture of what you are building?
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #24 on: September 04, 2018, 12:54:17 AM »
Carl a video is worth a million words.  It is George's four cylinder.  I am currently machining the front of the block.  The pocket is where the timing gears will reside.


-Bob
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Offline zeeprogrammer

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #25 on: September 04, 2018, 12:56:54 AM »
Fantastic!
And thanks. That's going to be a fun engine!  :ThumbsUp:
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Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #26 on: September 04, 2018, 08:50:33 PM »
Block continued-

Once all of the pocket was milled with the 3/16 endmill that I was using, I moved onto the od of the pocket that protrudes beyond the block.   I calculated the wall thickness and used my Starrett 220 Multi-Anvil Micrometer to verify the dimension.  Next, the bottom edge of the block was indicated square to the table.  This allowed me to position x and y in order to cut a .355 radius inside the pocket.  The radius is required for the crank timing gear.  I used my boring head to cut the radius.  The process was repeated, and a .434 radius was cut for clearance for the water pump.

-Bob
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Online b.lindsey

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #27 on: September 04, 2018, 10:08:21 PM »
You are on a roll Bob!! Always like following your builds.

Bill

Offline 90LX_Notch

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #28 on: September 05, 2018, 01:19:56 AM »
You are on a roll Bob!! Always like following your builds.

Bill



Thanks Bill!  You made my day!  I was able to even get a little shop time in this evening.  I'll post the pictures tomorrow.

-Bob
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My Engine Videos on YouTube-
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Online Tennessee Whiskey

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Re: GDB Inline 4 Cylinder OHV I.C.
« Reply #29 on: September 05, 2018, 07:44:05 PM »
I’m here also Bob. Looks like you are moving right along. ‘Fraid you’re going to have to find something larger than a pill bottle to take this one to shows in though 8)

Eric