Author Topic: Boxtool for small shafts  (Read 16699 times)

Online Jo

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Re: Boxtool for small shafts
« Reply #30 on: October 31, 2014, 09:00:43 PM »
Ok so you have to take two cuts side by side  :shrug:

Jo
Enjoyment is more important than achievement.

Offline Mosey

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Re: Boxtool for small shafts
« Reply #31 on: October 31, 2014, 09:08:57 PM »
Jo,
Glad you got the clips you need.
Mosey

Offline Mosey

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Re: Boxtool for small shafts
« Reply #32 on: October 31, 2014, 09:12:48 PM »
It is time to simplify this matter, so I am going to use what Bob Shores and many others do by making the valves and cages out of drill rod. As I mentioned, I am unable to turn stainless successfully. so stick to something easy.
Mosey

Offline Mosey

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Re: Boxtool for small shafts
« Reply #33 on: November 01, 2014, 02:55:31 PM »
What do folks think of making the valve cages out of Cast Iron? Bronze?

Steve, what do you think?

Mosey

Offline Dave Otto

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Re: Boxtool for small shafts
« Reply #34 on: November 01, 2014, 11:53:13 PM »
Hi Mosey

I think either one would be fine.

Dave

Offline Mosey

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Re: Boxtool for small shafts
« Reply #35 on: November 04, 2014, 11:17:22 PM »
Making some valves tonight using a trial method I think might be easier than some.
Put the drill rod in the chuck and hold it's outboard end in a live center.
Turned the valve shaft and head.
Parted off the new valve (no live center of course).
Now I just have to cut off the extra stem length and I'm done.
There was no tendency for the valve to bend due to pressure from the live center, which was adjusted.
I gave it a little polish while I had it in the lathe.
This "Mosey" method seems pretty straight forward

Offline gmac

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Re: Boxtool for small shafts
« Reply #36 on: November 05, 2014, 01:02:53 AM »
Mosey Method Version 2.0 ........ how about cutting two valves in one setting; stem to stem  :thinking:

Nice work Mosey !

Cheers Garry

Offline Mosey

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Re: Boxtool for small shafts
« Reply #37 on: November 05, 2014, 02:55:19 AM »
Garry,
Interesting thought, hmm?
Maybe double length would allow enough flex to bend the shaft? Have to give it a try.
Thanks,
Mosey :thinking:

Offline Mosey

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Re: Boxtool for small shafts
« Reply #38 on: November 15, 2014, 04:11:47 PM »
Made some valves today, incorporating all of the learned suggestions provided on this forum. I settled on the Step-turning method, and it works for me.

1. Turn end of shaft to +.001" over the final shaft dimension of 0.110"




2. Cut Groove for E-Clip 0.080" Diameter


3. Turn the rest of the shaft up to the valve head
4. Turn recess under the head and finish the underside of the head. Don't turn any bevel for seat. That will come when I seat valves on the cages.


5. Part off the valve


Polish the stem to final dimension and to make smooth and shiny.


6. Finish the top and rocker ends of the vales by sanding on a diamond file.


Here is a view of a nearly final valve. Tiny, aren't they?

Thanks for all of the help and patience as I learn to do this.

Online Roger B

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Re: Boxtool for small shafts
« Reply #39 on: November 15, 2014, 06:34:03 PM »
Looks a good technique to me  :ThumbsUp:  :ThumbsUp: One to try if I can't find suitable bolts/screws.
Best regards

Roger

Offline Mosey

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Re: Boxtool for small shafts
« Reply #40 on: November 25, 2014, 06:59:12 PM »
 Made some cages today. Using 642 Silicon Bronze round. This turns differently from any bronze I have ever used, in that it extrudes under cutting pressure. Finish is lovely.
1. Center drill end of bronze rod.

2. Turn rod to size .281"

3. Bore the internal hollow observe the ragged edge

4. Drill thru hole for stem..undersize

5. Ream shaft hole to size .108"

6. Bevel inside of cage to make a seat

7. Part off the cage using catcher (solder)

8. Here is an almost finished valve and cage, ready for lapping of the seat. I am waiting on a digital microscope for that work.

Online Roger B

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Re: Boxtool for small shafts
« Reply #41 on: November 25, 2014, 07:05:02 PM »
Looking good, the cages are .281" so about 7mm  :ThumbsUp: What are you intending to use to lap the valves?
Best regards

Roger

Offline Mosey

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Re: Boxtool for small shafts
« Reply #42 on: November 25, 2014, 09:25:56 PM »
I intend to use either or both Timesaver 80 Yellow for the bronze cages, and 111 Green for the steel valves. I am unsure of how this will go. I intend to observe the progress with my new microscope, after I see what the seats look like under magnification.
All suggestions will be carefully considered.
I do know this, the valves and cages I made last time looked great in my visor and leaked like Swiss cheese, because they were quite full of tiny ridges. They will be tested before going into the engine. I hope.   :headscratch:
Mosey

Offline Mosey

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Re: Boxtool for small shafts
« Reply #43 on: November 26, 2014, 09:23:35 PM »
Here is the first microphoto of my valve and cage taken with my new digital telescope. Wow, I guess some work needs to be done to lap the seat!
But at least, I can see what needs to be done rather than guessing.

Mosey

Offline Mosey

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Re: Boxtool for small shafts
« Reply #44 on: December 11, 2014, 10:33:38 PM »
I have been working with a method of cutting valve seats using the George Britnell seat cutter method, which seems to me to be a good way to go. George was gracious enough to share his drawings with me, Thank you.

First I made the GB Cutter Tool.

I turned a round rod of W1 steel to the 46 degree seat angle, undercut at the base of the cutter, and then milled 4 flutes in it in the indexing head, to make cutting edges.
Heat treated to carrot orange color and then into a brine bath for quenching.
Diamond filed the tiny cutting edges and made a little handle.
Then I test cut a seat in a sample bronze cage.
Looks quite nice under the microscope. The cut seat is smooth and ready for final lapping to the valve itself.
Hope you like it.
Mosey

 

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