Van Norman Rotary Broach at auction

[MFDAC]

Looks like it is doing a great job, CJet!

DAC

 

[4getgto]

My brother came over we set the cutting bits up as close as we can until we get a dial indicator setup for this task. Decided to make another test cut on the manifold surface of the Minneapolis Moline ZA cylinder assy. The new bits cut way better than the old dull one's. Its actually plenty good to use as is but we will still try to dial it in some more. We then tried a Ford 351 Cleveland head to see how it worked on a longer cut. Worked great on that head also.

I know your only cutting half/ thousandth at time but a head for example where do you measure for a reference point ? If that make sense. Obviously you take to much off and how many times was it cut before. ?

 

[cjet69]

I know your only cutting half/ thousandth at time but a head for example where do you measure for a reference point ? If that make sense. Obviously you take to much off and how many times was it cut before. ?

The goal is to take off as little as necessary. This Minneapolis Moline cylinder assembly is a scrap that we are using for our test and setup. We are taking 2 to 3 thousandths per cut. The main thing you want is the surface being cut is parallel to the cutter head. On this machine you set the surface to be cut on the table with 4 pieces of shim stock of equal thickness and then clamp it down. You then run the cutter head up until it just touches, zero out the cutter head dial, and then set your cut depth. The dial is all in thousandths. If your milling heads on a v-8 you want to take the same amount off each head.

 

[MFDAC]

The goal is to take off as little as necessary. This Minneapolis Moline cylinder assembly is a scrap that we are using for our test and setup. We are taking 2 to 3 thousandths per cut. The main thing you want is the surface being cut is parallel to the cutter head. On this machine you set the surface to be cut on the table with 4 pieces of shim stock of equal thickness and then clamp it down. You then run the cutter head up until it just touches, zero out the cutter head dial, and then set your cut depth. The dial is all in thousandths. If your milling heads on a v-8 you want to take the same amount off each head.

Milling heads on a V-8 also affects the intake manifold, and distributor height if it mounts in the intake. We would have heads angle milled, then the intake would have to be milled to match then the distributor would have to be shimmed back up to mesh the cam right and engage the oil pump properly. A flat mill can usually be worked out on the intake with thicker head gaskets. That defeats the purpose of milling to gain compression though. It goes on and on! Just light cleanups shouldn't affect much.

DAC