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01-19-2023, 08:44 PM | #1 |
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Jig for milling ford rear main caps
Hi does any one have or know some who has made a JIG to mill the rear main caps , I have a 40 block that was missing the main caps , took some off a bad 59 block , but they need to be milled so he can line bore it , I’d be glad to pay what ever is needed for the jig , I’d buy or rent , please help , thanks John
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01-19-2023, 09:40 PM | #2 |
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Re: Jig for milling ford rear main caps
Since I have the correct Quikway line boring equipment to machine flathead blocks I made my fixture so I could machine main bearing caps. The important part of the fixture is the center line needed for rotation to maintain the radiused step diameters. The amount of material removed from the area of the caps that touch the block for the line bore step must also be removed off the radiused step surface. To do this a rotary table is needed plus the fixture.
Ronniroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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01-19-2023, 11:22 PM | #3 |
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Re: Jig for milling ford rear main caps
Interesting. I have always thought they just mill off the contact at the block and let the boring tool make it round again. Is that too much material to take and maintain accuracy?
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01-20-2023, 07:37 AM | #4 |
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Re: Jig for milling ford rear main caps
A fella here in the UK made a steel cap and turned the register in a lathe. If the cap could be held in a 4 jaw chuck it could be skimmed in a similar way.
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01-20-2023, 07:48 AM | #5 |
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Re: Jig for milling ford rear main caps
it takes a bit of work to center, i have used a 4 jaw chuck to hold cap in lathe
If you have 3 sets of caps most likely 2 of the sets fit so close that line boring is not needed |
01-20-2023, 08:56 AM | #6 |
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Re: Jig for milling ford rear main caps
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ramps |
01-20-2023, 02:31 PM | #7 |
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Re: Jig for milling ford rear main caps
There's a few guys I know who had the block surface of there flatheads decked instead taking the material off the bearing caps. Sadly the shops doing the work removed to much from the block. When that happens you now need to find a shop that's able to machine the cam gear teeth deeper that's a very hard thing to do.
In my area no one decks blocks anymore they only line hone all the shops remove the material from the caps including flatheads. Its a simple fast process and profitable for auto machine shops to do it that way. Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
01-20-2023, 03:43 PM | #8 |
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Re: Jig for milling ford rear main caps
I have 2 ways to do it.
1 - 4 jaw in lathe. Disadvantage is long setup time. Advantage is quick machining time. 2 - Vise in mill. Advantage, minimal setup time. Disadvantage, slow machiine time. Total time for job about the same either way. |
01-20-2023, 04:03 PM | #9 |
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Re: Jig for milling ford rear main caps
Still confused here, why would one need to cut the radius for the bearing shell, I thought that was what the line bore was for ?
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01-20-2023, 05:04 PM | #10 |
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Re: Jig for milling ford rear main caps
I have done them in my mill very slowly by hand to contour radius of register. In future I will be setting up to cut them like Ronnieroadster.
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01-20-2023, 05:53 PM | #11 | |
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Re: Jig for milling ford rear main caps
Quote:
Please note I have not done this, just saying what I understand. |
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01-20-2023, 05:56 PM | #12 |
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Re: Jig for milling ford rear main caps
Thanks Mart !
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01-20-2023, 07:10 PM | #13 | |
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Re: Jig for milling ford rear main caps
Quote:
The line boring will complete the bearing housing radius. The radiused step register is the area that creates a more time consuming material removing process. Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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01-20-2023, 07:15 PM | #14 | |
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Re: Jig for milling ford rear main caps
Quote:
Amount of time needed to remove the material from the bearing cap less than a minute per cap. When using a fixture set on a rotary table that's located on the spindle center line. Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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01-20-2023, 09:23 PM | #15 |
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Re: Jig for milling ford rear main caps
Align honing of the main line is NOT the way to go for a race block.
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01-21-2023, 08:23 AM | #16 |
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Re: Jig for milling ford rear main caps
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01-21-2023, 03:51 PM | #17 |
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Re: Jig for milling ford rear main caps
You do not want to move the mainline up. Honing takes an equal amount off the block and the cap. When you bore, you line up on the block so nothing but the disccoloration is removed from the block.
Same deal when you bore pumpkin saddles. |
01-21-2023, 03:53 PM | #18 |
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Re: Jig for milling ford rear main caps
Here's the fixture I made and how the main bearing cap is held in place. Overall it was a simple back yard Hot Rod project so I could line bore Ford flathead blocks using our own equipment.
The Quickway line boring system we use is extremally accurate mine dates back to the 40's. To date we have used this equipment on everyone of the Ford flathead blocks we have set many records with. Including the five main bearing girdle assembly we use on our 600 horsepower 292 cubic inch ARDUN race engine. I'm a self taught machinist for a living I worked 38 years on the railroad testing and repairing signal systems from basic old tech to high tech computer based logic controls. That was my dream job loved being on the railroad. In the afternoons after work when time would allow after family stuff I spent time on my passion Hot Rods and Ford flatheads. In retirement I spend most days in the shop on numerous Hot Rod related projects and also at times some stock Ford items as well. My wife calls me tired retired. Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH Last edited by Ronnieroadster; 01-21-2023 at 04:04 PM. |
01-21-2023, 09:24 PM | #19 | |
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Re: Jig for milling ford rear main caps
Quote:
Maybe because we have railroad experience in common.... |
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01-23-2023, 10:39 AM | #20 |
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Re: Jig for milling ford rear main caps
Often wondered why you couldn't clamp a cap in a vice and file a few thousants off it. Slap it on the block and line bore it. Would the hole be out of round? would it be in the wrong place? would it work???? Probably need a precision file
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01-23-2023, 02:40 PM | #21 | |
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Re: Jig for milling ford rear main caps
Quote:
Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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01-23-2023, 10:59 PM | #22 |
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Re: Jig for milling ford rear main caps
Just wondering how many guys did this? Once the cap is torqued down, how much could it move in a stock or near stock engine. We'll probably never know!!!
G |
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01-24-2023, 12:33 AM | #23 |
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Re: Jig for milling ford rear main caps
I've seen them broken in stock engines.
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