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  #11  
Old 01-02-2021, 11:42 AM
Ambush Ambush is offline
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Red Dave " Gee honey, isn't this fun, both of us working together in the kitchen? Why aren't you smiling?"

You won't need blue to show the low spots on aluminum, they'll show up as dark areas. And it clogs the paper, which should be "closed" paper as well.
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  #12  
Old 01-02-2021, 12:32 PM
CubbyRI CubbyRI is offline
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Quote:
Originally Posted by Red Dave View Post
I never heard of using particle board, but if it is flat enough, why not?

I used a flat machinists stone in the past for heads on single cylinder engines, and to re-surface the bottom plates on Farmall oil pumps too. But that plate is back at the place I retired from, so I no longer have easy access to one.

We re-did the kitchen last summer and installed granite counter tops. They look just like a machinists stone.
I wonder if she would mind?

You know - I got granite counter top and they gave us an extra piece as a cutting board we dont use. Hmmmmm wonder how flat that is...
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  #13  
Old 01-02-2021, 12:43 PM
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You can use plate glass..it is very close enough if not perfect but the thicker is better as it doesn't flex as much... 3/8" or even 1/2" is good but avoid the tempered glass.

Go to your local glass place and get a piece 10"x12" so you can lay a sandpaper on it.

Particle board or MDF is ok, but it does swell and warp from moisture.
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  #14  
Old 01-02-2021, 12:50 PM
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What is the issue with tempered glass?
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  #15  
Old 01-02-2021, 01:05 PM
CubbyRI CubbyRI is offline
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Ok what started this was watching a youtube where he used glass and 3M 320 wetordry sandpaper and water. Said it would clog without water. So, I ordered a small qty of wetordry and its 220, 320, and a finer one as well.

As I mentioned, this is a mower engine and I wonder how tite the tolerance is before it affects reliability. I bet (just a guess) a few thousandths between high and low would be taken up by the gasket with no reduction in how long it stays sealed. But I dont really know, so I asked Google.

Kohler head flatness spec is .003" or less

I suppose I could clamp it into my Bridgeport and run the indicator over it but the BP is kinda beat and hasnt been gone through yet. Not sure how much deflection when moving the table around and it hasnt been trammed yet because I havent mastered that yet! Maybe this is the excuse to play with that a bit. Then the machine in theory could mill the head flat but I suspect the sandpaper on glass technique would allow the least loss of material...
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Model 100 Feb 2019 apart for total frame-off / sandblast etc resto

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  #16  
Old 01-02-2021, 01:38 PM
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Originally Posted by darkminion_17 View Post
What is the issue with tempered glass?
When a glass is tempered, the flat glass gets distorted by the heat, especially around the edges. In the woodworking circles, we use plate glass to flatten stones used for sharpening chisels and hand plane blades. Is it often said to avoid the tempered glass!

Here's a copy and paste from google search:. Immediately after heating, the glass surfaces are rapidly cooled by quenching with air from a series of nozzles. The original flatness of the glass is slightly modified by the heat treatment, causing reflected images to be distorted
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  #17  
Old 01-02-2021, 07:12 PM
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Interesting. So non-tempered hardware store glass sufficiently flat you think?

Also, I believe the right thing is called a "surface plate" and they are made of granite, and also cast iron maybe a few other materials...
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Model 123 Nov 2020 Hydro needs much work, or resto, building front end loader for this one
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  #18  
Old 01-02-2021, 07:23 PM
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Soft cast iron is used for lapping with diamond powder and an oil vehicle. The cast is soft and the diamonds embed in it and cut the item being lapped. Much like the paper in sandpaper is soft yet you can cut steel with it. If you're set on using glass, make sure it is flat, thick and well supported. You can put in on the particle board that I'd use instead. Well, actually, I'd mill it.
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Old 01-02-2021, 10:00 PM
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Finally found an example of workholding for one of these heads in a milling machine. Clamped in the vice by the sides. And he's using an end mill not a fly cutter. Maybe I can do this...

https://youtu.be/QB7wkykHRIA
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Model 100 Dec 2020 - Running condition, has snow plow!
Model 123 Nov 2020 Hydro needs much work, or resto, building front end loader for this one
Model 100 Feb 2019 apart for total frame-off / sandblast etc resto

Model 70 Sep 2020 needs total resto and an engine, or for parts
Model 70/100 Mar 2021 buried in rust, frozen engine, got free for parts.

two spare hydro rears
"in for a penny, in for a pound!"
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  #20  
Old 01-03-2021, 07:39 AM
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Originally Posted by CubbyRI View Post
Finally found an example of workholding for one of these heads in a milling machine. Clamped in the vice by the sides. And he's using an end mill not a fly cutter. Maybe I can do this...

https://youtu.be/QB7wkykHRIA
Looks to me, like a good way to ruin a perfectly good head.
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