Author Topic: Zee Needs Popcorn  (Read 57406 times)

Offline 10KPete

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Re: Zee Needs Popcorn
« Reply #150 on: July 20, 2018, 12:19:21 AM »
Zee, here's a good example:

<a href="https://www.youtube.com/watch?v=pAngKHIZgyA" target="_blank">http://www.youtube.com/watch?v=pAngKHIZgyA</a>

I never, or rarely, 'step drill' anything or use pilot holes except in the most unusual situations.

Pete
Craftsman, Tinkerer, Curious Person.
Retired, finally!
SB 10K lathe, Benchmaster mill. And stuff.

Offline zeeprogrammer

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Re: Zee Needs Popcorn
« Reply #151 on: July 20, 2018, 01:37:19 AM »
Thanks Pete.  :ThumbsUp:
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline zeeprogrammer

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Re: Zee Needs Popcorn
« Reply #152 on: July 20, 2018, 01:39:15 AM »
Despite Jason's help  :lolb: I got the flywheel done.

It runs true on the lathe. Will have to see how it goes once it's assembled in the model.

It's nice to have a success (or near success) once in a while.  ;D
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline propforward

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Re: Zee Needs Popcorn
« Reply #153 on: July 20, 2018, 02:06:19 AM »
Very nice! Great work.
Stuart

Forging ahead regardless.

Offline crueby

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Re: Zee Needs Popcorn
« Reply #154 on: July 20, 2018, 02:13:31 AM »
Zee, here's a good example:

[youtube1]https://www.youtube.com/watch?v=pAngKHIZgyA[/youtube1]

I never, or rarely, 'step drill' anything or use pilot holes except in the most unusual situations.

Pete
Pete - great video, I did not realize the modification was so small.

Zee - excellent looking wheel!

Offline b.lindsey

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Re: Zee Needs Popcorn
« Reply #155 on: July 20, 2018, 02:17:47 AM »
Nice looking flywheel Zee. I would call that a success for sure.

Bill

Offline john mills

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Re: Zee Needs Popcorn
« Reply #156 on: July 20, 2018, 02:20:38 AM »
That picture shows the flat that is all that is required it only needs a little to make a difference.

Offline sbwhart

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Re: Zee Needs Popcorn
« Reply #157 on: July 20, 2018, 07:07:20 AM »
Despite Jason's help  :lolb: I got the flywheel done.

It runs true on the lathe. Will have to see how it goes once it's assembled in the model.

It's nice to have a success (or near success) once in a while.  ;D

That looks a good job.

Stew
A little bit of clearance never got in the way

Offline Jasonb

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Re: Zee Needs Popcorn
« Reply #158 on: July 20, 2018, 07:17:56 AM »
Well at least you should be able to work to a better accuracy than +/- 1/8" now :LittleDevil:

You hurt me. You hurt me bad.


Zee, I thought I was being kind to you by rounding the 0.130" DRO error down to 1/8" :LittleDevil:

Offline kvom

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Re: Zee Needs Popcorn
« Reply #159 on: July 20, 2018, 12:42:45 PM »
I'm the same as Chris, one set of drills for everything.  For brass I've never had a need to step drill, but perhaps it's because I have larger machines.  I will generally ream if the target hole matches a reamer I own, otherwise bore.  I have a number of small boring bars but they are usually too short for a cylinder.  In any case, a cylinder bore diameter isn't often critical as long as the piston is turned to fit.

Offline Steamer5

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Re: Zee Needs Popcorn
« Reply #160 on: July 20, 2018, 01:30:25 PM »
Hi Zee,
 Every little step forward is progress & you are making them!!
Just caught up, I think I had a similar issue with the readout on my mill, cant remember   :old: how or what caused me to look into it but it was sorted just like you have!

Cheers Kerrin
Get excited and make something!

Offline zeeprogrammer

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Re: Zee Needs Popcorn
« Reply #161 on: July 21, 2018, 12:03:58 AM »
Thanks all.

Well today went relatively well...no doubt due to the loads of good advice I got.
Here's my report  ;D

I starting drilling with a 1/4" and went up by 1/16 from there until I got to about 29/64. (Yeah..I know that math doesn't work out.)
Most of the time it went great. Two observations...

1) Each time I drilled I could tell the brass was trying to pull the drill bit out of the tail stock. It helped if I fed a little faster but I didn't like doing that. That kind of tells me that the idea of having brass only bits may be a good idea.
2) At one point, with a larger drill bit, the system stalled. I was running about 300 RPM with a drill bit about 7/16 or slightly less. I think the speed was too low or my system can't provide the torque at that setting.

I finally got to a large enough diameter that my boring bar would fit. That went pretty well.
I bored until I was within about 1/64 then I reamed.

1st Pic shows the boring.
2nd Pic shows the reaming.
3rd Pic shows the outline I'm going for with a 0.500 bearing shaft in the bore. A little tight which I think is good at this point.

One last observation...which bothers me a bit...

I had squared the stock on the mill then went to the lathe. One would think (or I had thought) that if the stock was perfectly square then a facing operation of 1 thou would take 1 thou off the entire face. Not so. It took about 5 or 6 thou before the entire thing was faced. It was slightly worse when I flipped the part and face the other end.

I had squared the stock using a 3/4" end mill and was pleased to see the expected pattern of a trammed machine...in the X direction.
But I believe, the Y is off. By some significant amount given the size of the part is at most 1.375".

However, I'll be interested in anyone's thoughts on similar findings.

To me this means the bore is not square with the bottom of the part. I think this can be corrected when I put in the holes, ports, and shape the cylinder. Even if this takes a bit off the bottom, the pedestal can be raised to account for it.

If you can't tell...I'm somewhat chuffed (as they say).

One thing that bothers me...When I look at the end where the reaming started...it looks pretty decent. But at the other end I see a little grooving as if the boring bar was wider there and the reamer did nothing.

Foo. Maybe not so chuffed. Makes me think the tail stock is not in line.

Oh well. At this point (posting my results) I've been celebrating and I'll worry about that tomorrow.  ;D  :cheers:
Progress is progress and this was progress.
(Despite the fact that youngest daughter came over and she and wife insisted I join them in the pool. Slowed me down.)

I feel good and that's what matters.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline zeeprogrammer

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Re: Zee Needs Popcorn
« Reply #162 on: July 21, 2018, 12:07:03 AM »
I don't know why the picture of the reamer doesn't show.
But at this point...I'm not even allowed to turn on a machine much less figure things out.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline zeeprogrammer

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Re: Zee Needs Popcorn
« Reply #163 on: July 21, 2018, 12:08:30 AM »
Rats. And now the picture shows.

Apparently I am not in sync with today's technology...regardless that I'm an embedded systems engineer.

Good night.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline b.lindsey

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Re: Zee Needs Popcorn
« Reply #164 on: July 21, 2018, 12:49:20 AM »
Sounds like some good progress was made Zee. Enjoy the evening and jump back in tomorrow.

Bill

 

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