Mark VII speed control

Richardrouse2 · Post by **Richardrouse2** » Thu May 04, 2017 9:54 pm

Like a hemorrhoid I am back..

I lost my old log in information... and even my old email to which the account was tied to.

We once had a workable speed control cam for the Mark VII... I printed a freaking box of them... then I moved to michigan... god knows where that box went.

We also had the gear rack for the tubes... I think the gears and the cams are together somewhere.. Perhaps still in Florida... perhaps theyve gone to that great woodworking shop in the sky..

and of course... the files that I worked on are nowhere to be found either!!! FML

After a long winter, and some grey days I am coming back out of hiding.

another member has found a source in Chicago that can print these things a heck of a lot cheaper than I ever could.

The also have Direct metal laser sintering technology. which means that we could get the racks and the cams made out of aluminum... or stainless.

I'm willing to redraw the models. I know several members have contacted me in the past month asking if I had any of these left.

If there is interest in this, I need some help. I've already redrawn the model for the gear and sent that to another member to run down some pricing info.

The cam is a whole different beast

I need some dimensions on the control cam. Unfortunately, I either sold my Mark VII before the move or it is sitting in my father in law's garage in Florida.. i can't remember anymore. Either way it is not in Michigan with me.

I have a photo of the control cam on graph paper so I'll be able to get the curve of that right..

What I need to know is the following:
1) the thickness and the width of the lip that goes around the cam
2) the thickness of the central part of the cam
3) the size of the hole that the cam goes through
4) the size of the hole that the roll pin goes into that holds it to the speed control shaft.
5) the placement of that hole
6) The height of the collar that goes around the hub.

is what I can think of at the moment.

JPG · Post by **JPG** » Fri May 05, 2017 1:00 am

Richardrouse2 wrote: . . .uu
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I have a photo of the control cam on graph paper so I'll be able to get the curve of that right..

What I need to know is the following:
1) the thickness [0.120] and the width [0.830] of the lip that goes around the cam
2) the thickness [0.165] of the central part of the cam [web]
3) the size of the hole [0.440] that the cam goes through [shaft hole]
4) the size of the hole [ 0.125]that the roll pin goes into that holds it to the speed control shaft.
5) the placement of that hole
6) The height of the collar that goes around the hub. [0.140] [0.580]

is what I can think of at the moment.

7) OD of the hub. [0.740]
8) reduced height of hub = 'width' of cam. [0.345 above web]

See attached pix for further details around tension pin hole and web.

9) Width of narrowed width [0.355] symmetrical about center web.

: detail side.jpg (170.83 KiB) Viewed 10913 times

notch 0.250 wide 0.170 from end of truncation. Notch centered relative to pin hole.

: pin hole and hub truncation.jpg (264.41 KiB) Viewed 10913 times

: profile and angular locations.jpg (181.36 KiB) Viewed 10913 times

: detail web.jpg (162.94 KiB) Viewed 10913 times

Total width 0.355 symmetrical about web(0.95 both sides)

Almost sure you will have ????

Richardrouse2 · Post by **Richardrouse2** » Fri May 05, 2017 4:31 am

You the man as always JPG!

I'll definitely have questions once I get started. Hoping to tear into this model tonight / over the weekend.

Richardrouse2 · Post by **Richardrouse2** » Fri May 05, 2017 5:23 pm

Gears can be made from nylon for less than 10 bucks and from stainless steel for less than 80. That's per piece on each section. You would need 4 sections to replace the whole rack. They could also be made from aluminum but would cost 600 bucks per piece.

The stainless pieces are created through a jet bonding process, the aluminum is through laser sintering, the nylon is through a laser sintering process as well.

The company that would be handling the printing think that the nylon piece would work fine.

5 day lead time on nylon. 15 day on metal.

jsburger · Post by **jsburger** » Fri May 05, 2017 6:31 pm

Richardrouse2 wrote:Gears can be made from nylon for less than 10 bucks and from stainless steel for less than 80. That's per piece on each section. You would need 4 sections to replace the whole rack. They could also be made from aluminum but would cost 600 bucks per piece.

The stainless pieces are created through a jet bonding process, the aluminum is through laser sintering, the nylon is through a laser sintering process as well.

The company that would be handling the printing think that the nylon piece would work fine.

5 day lead time on nylon. 15 day on metal.

A typo perhaps. $80 for stainless and $600 for aluminum???

Richardrouse2 · Post by **Richardrouse2** » Fri May 05, 2017 7:39 pm

No sir that is correct. The reason for the drastic price difference is that the aluminum uses the laser sintering process while the stainless uses a jet bonding process.

The cost has more to do with the process than the materials. I questioned that as well and they assured me it was correct

jsburger · Post by **jsburger** » Fri May 05, 2017 7:42 pm

Richardrouse2 wrote:No sir that is correct. The reason for the drastic price difference is that the aluminum uses the laser sintering process while the stainless uses a jet bonding process.

The cost has more to do with the process than the materials. I questioned that as well and they assured me it was correct

All I can say is WOW!!! I don't know anything about the technical stuff but it seems to me that metal can be machined (CNC or not) for a LOT less than $600 each. We are not talking space shuttle grade processes, and tolerances here.

Richardrouse2 · Post by **Richardrouse2** » Fri May 05, 2017 8:04 pm

I agree.

Even the sales person told me that the sintering process was overkill for this application.

He said that the real value in that process was in parts that have interior cavities that are impossible to Machine. I'd be curious to see what a machinist would charge just for grins. I can't imagine imagine that it would cost that much.

jsburger · Post by **jsburger** » Fri May 05, 2017 8:40 pm

Richardrouse2 wrote:I agree.

Even the sales person told me that the sintering process was overkill for this application.

He said that the real value in that process was in parts that have interior cavities that are impossible to Machine. I'd be curious to see what a machinist would charge just for grins. I can't imagine imagine that it would cost that much.

Check this out.

https://www.youtube.com/watch?v=9WXHNBMLZZM

Watch all his videos. I bet he can make what is needed as long as he has a sample or a print. This guy is really cool. My grandfathers wood working business never was steam powered or had the overhead shafts but a bunch of the machines did have flat leather belts and I have fixed more than one of them as described in one of his videos.

n240sxle91 · Post by **n240sxle91** » Sat May 06, 2017 4:10 pm

Welcome back Richard!

I just want to make sure it's clear, like Richard said before... it's $80 PER piece, and you need (4) pieces to complete the gear rack. That should be a one time replacement cost, but at $10 per piece for the nylon you could replace that many times over and still spend a lot less than the stainless option. Something to think about!

That being said, I am very interested in the stainless option for the CAM!

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