Bad decisions were made today..

[obsolete]

"swiss screw machine"

That was a really good google search.

[csmutty]

That was a really good google search.

The mechanical ones with multiple spindles are kinda mind blowing.

Not sure if you saw this one.

https://youtu.be/y3y0tATB0lg?si=t0EYXUitYBn62hsQ

[jimmycapp]

The mechanical ones with multiple spindles are kinda mind blowing.

Not sure if you saw this one.

https://youtu.be/y3y0tATB0lg?si=t0EYXUitYBn62hsQ

Have you ever seen a gridley ? Not sure if that’s correct spelling. I worked for a manufacturer in new Britain that probably had the biggest collection of this early 1900 multi spindle mechanical screw machines. They would have 12 plus running at a time. Pretty amazing tech for its day. Definitely helped us win ww II.

[R7]

I mean it makes sense that valves would be expensive because of the tight tolerances and heavy amount of material removal. Would have to make them on a swiss screw machine with a guide bushing probably.

When I spoke with the guy at Kibble White, he said there isn’t much for material that gets removed. They have forged blanks that are close in size to the original valve, machine the finish, then add the coatings.

And an update on the valves, Kibble White has 2 of my original valves and confirmed they can make them. I sent them a deposit, and now it’s a waiting game. The price was $240.00 each valve, I’m only making the 8 I need.
The nascar place, Victory 1 performance, has been silent, so assuming they are a no go on the 2nd set at this point.

[Jim]

$2k for valves is nuts. hopefully you'll never need to replace them.

this thread keeps me checking the forum on a daily basis

[jimmycapp]

When I spoke with the guy at Kibble White, he said there isn’t much for material that gets removed. They have forged blanks that are close in size to the original valve, machine the finish, then add the coatings.

And an update on the valves, Kibble White has 2 of my original valves and confirmed they can make them. I sent them a deposit, and now it’s a waiting game. The price was $240.00 each valve, I’m only making the 8 I need.
The nascar place, Victory 1 performance, has been silent, so assuming they are a no go on the 2nd set at this point.

Forged blanks are the right way to make them. Glad you found these guys.

[Paul_E_D]

$2k for valves is nuts. hopefully you'll never need to replace them.

this thread keeps me checking the forum on a daily basis

Not really, R6 valves are 120 ea. For a custom set, that seems reasonable to me.

[csmutty]

Have you ever seen a gridley ? Not sure if that’s correct spelling. I worked for a manufacturer in new Britain that probably had the biggest collection of this early 1900 multi spindle mechanical screw machines. They would have 12 plus running at a time. Pretty amazing tech for its day. Definitely helped us win ww II.

That is neat! Yeah I think they are referred to as Acme Gridleys. Those have much larger capacities than the Davenport and more attachments. The main advantage of the Davenport is the reduction in mass of the carrier/spindles so they can rotate quickly. With some configurations I have seen the Davenport achieve a cycle time of 0.5 seconds per part (making 2 parts per second) with manufacturing a simple threaded nut.

https://www.coxmanufacturing.com/acme-machines

[csmutty]

Forged blanks are the right way to make them. Glad you found these guys.

Is that because of the material properties from the forging process?

[jimmycapp]

Is that because of the material properties from the forging process?

I'm more familiar with it for bolt forming. When you cut across the grain structure, you lose a lot of strength. I don't think it's so much a material property change from the forge, you just aren't disrupting the grain structure if it's forged close to form, then machined on the critical surfaces.

[butcher bergs]

Updates?

[R7]

Updates?

I’m still waiting for the valves. They’re made and were sent to the coating company a week ago. I should have them in a couple more weeks.
All other parts, I already have.

[R7]

The new valves are complete and have shipped, tracking says they will arrive tomorrow
I’m excited to see them, more excited to finally get this bike running again.

[xrocket21]

Progress is good!!!!!!!

[tsorfas]

We are just as excited

[R7]

And they arrived a day early! Just organized all the parts and will drop everything off at the shop in the morning.

[FriskyDingo]

Purtty... Trump would LOVE those great, beautiful, special gold thingies...

[union]

Looking at the valves I'm assuming the original ones are the greyish one? Was a different alloy used or some sort of coating applied the the new ones?

[R7]

Looking at the valves I'm assuming the original ones are the greyish one? Was a different alloy used or some sort of coating applied the the new ones?

Yes, the grayish ones are the originals. The new valves have a coating on them, that most of it will likely burn off. If you look closely at the two originals, you’ll see the oem coating on the tops of the valves where keepers are

[Stoneman]

Man, that's incredible!

[Paul_E_D]

The R7s new nickname is Goldfinger!