Author Topic: Monitor Steam Engine  (Read 222029 times)

Offline zeeprogrammer

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Re: Monitor Steam Engine
« Reply #60 on: December 30, 2015, 11:04:56 PM »
Thanks Dave. The olive is what I was thinking of when you mentioned it.
I didn't know about the kind in your second link though. Interesting.

Still...I'm troubled that nothing shows in the plans about this. But maybe that's usual?

Thanks again.
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Offline Bluechip

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Re: Monitor Steam Engine
« Reply #61 on: December 30, 2015, 11:22:39 PM »
The soldered nipple and nut should really be in the plans if that's what it should be.  :headscratch:
But they are available from UK suppliers at least, so maybe the plans assume 'bought in' parts ?? Dunno.

For the odd few I've made, I use the nipple/nut arrangement because they are easy to make in the shop. The olives, at least for small bore tube, are often soft copper as they need to deform to make an effective seal. Not so easy ..

Maybe wait for some other, more competent, replies.  ;D  Although there aren't many options available for tube joints.

Dave



« Last Edit: December 30, 2015, 11:26:21 PM by Bluechip »

Offline bruedney

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Re: Monitor Steam Engine
« Reply #62 on: December 30, 2015, 11:27:49 PM »
Nice Carl

Did you cut the thread on the lathe?

I am making a Julius design and have been using the taps and dies that I have. http://www.modelenginemaker.com/index.php/topic,4882.0.html

I am not sure I can get my lathe to go slow enough to turn up to a shoulder. I have a low speed brushless DC motor that I am looking to retro fit to give more control

I have the metric plans of this to look at next so following with interest.

Bruce
‘Results! Why man, I have gotten a lot of results. I know several thousand things that won’t work.’ — Thomas Alva Edison

Offline zeeprogrammer

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Re: Monitor Steam Engine
« Reply #63 on: December 30, 2015, 11:40:17 PM »
Yeah Dave. I'm sure others will pop in.

Bruce - no. I have no skill (yet) in threading on the lathe. This was done with a die. The part was in the lathe and I have a die holder that I use in the tailstock.
I think the metric plans are more interesting and give more detail.


What? Yes dear...I'm still in the basement. Be right there.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline b.lindsey

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Re: Monitor Steam Engine
« Reply #64 on: December 31, 2015, 01:12:43 AM »
First post 5:42pm...last post 6:40pm...pushing your luck there a bit Zee...we do want you to make it to 41  :LittleDevil: Nice looking part though !!

Bill

Offline Jasonb

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Re: Monitor Steam Engine
« Reply #65 on: December 31, 2015, 07:43:05 AM »
You need a nipple to fit the nut and the 5/32" hole in the nut needs increasing to clear the nipple 3/16" or 7/32" depending on how big you make the nipple. I'll sketch one out for you later. What angle have you done the chamfer ob the inlet? should be 60deg cut with a ctr drill not a 90deg CSK but if it is CSK you can get away with it.

Couple of nuts and nipples I made last week



A small boring bar or 2-flute endmill held in the toolpost and used as a boring bar will give the flat bottom to the tapping hole in the nut.
« Last Edit: December 31, 2015, 07:54:53 AM by Jasonb »

Offline Jasonb

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Re: Monitor Steam Engine
« Reply #66 on: December 31, 2015, 08:58:57 AM »
5/16x40 is actually larger than the usual thread used for 5/32" pipe fittings but as the part is made I've drawn a nipple to suit, the nut will need drilling through 7/32"


Offline vcutajar

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Re: Monitor Steam Engine
« Reply #67 on: December 31, 2015, 11:16:51 AM »
Nice to see that you have started on the Monitor.  I have saved the files but have not printed them yet.

When I come to that part most probably it will be a soft soldered job like I did on the Corliss.



Vince

Offline zeeprogrammer

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Re: Monitor Steam Engine
« Reply #68 on: December 31, 2015, 02:43:28 PM »
Bill - my luck held out.  ;D

Jason - thanks. Well I think that confirms your thinking Dave.

1) The chamfer. I didn't see a dimension on the drawing. The drawing looked like 45 degree (90) but without knowing about the olive/nipple I didn't know why. I'd used what I believe to be an 82 degree (41 degree slope) but can remake the part (I have to make another anyway. The plan calls for two.)....Actually, I think I can simply run the center drill in to correct.

2) Thanks for the tip on the 2-flute end-mill. I don't have a small enough boring bar and was starting to think about how to make one.

3) What is the thread pitch on the inlet/outlet of those valves?

4) Just making sure - CSK is countersink right?

5) 'zeenipple'  :lolb:

Vince - That may be difficult if I go by plan. Tubing has one of those glands on each end (one per cylinder). But I'm thinking of cutting the tubing in half and using a pipe tee to join them. So your suggestion will be kept in mind. (And the nut can still be used to retain the overall look.)

Now to put the zeenipple in my CAD and see if I have all this right.

Thanks for the help!

Oops - one more question...

For external threading - what should the rod be turned down to before using the die? I thought there was a formula but can't find it.
Turning to 5/16 for a 5/16 die did not go well. I had to shave a few thou off.
Now it could be that my measurement was off or that the die needs adjusting.
Which brings up another...how does one go about adjusting a die?

Apologies for all the newbie questions. Hopefully the frequency will drop off soon.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Bob Unitt

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Re: Monitor Steam Engine
« Reply #69 on: December 31, 2015, 03:27:39 PM »
Nice to see that you have started on the Monitor.  I have saved the files but have not printed them yet.

When I come to that part most probably it will be a soft soldered job like I did on the Corliss.



Vince
I did a soft-soldered joint like that on a Hercules steam crane. The first few runs were OK but eventually the steam temperature melted the solder, and the steam pressure blew it all out of the joint. I ended up making new parts and silver-soldering them together.

Offline Jasonb

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Re: Monitor Steam Engine
« Reply #70 on: December 31, 2015, 04:11:43 PM »
Bill - my luck held out.  ;D

Jason - thanks. Well I think that confirms your thinking Dave.

1) The chamfer. I didn't see a dimension on the drawing. The drawing looked like 45 degree (90) but without knowing about the olive/nipple I didn't know why. I'd used what I believe to be an 82 degree (41 degree slope) but can remake the part (I have to make another anyway. The plan calls for two.)....Actually, I think I can simply run the center drill in to correct.

You can use what taper you have or just recut with the centre drill

3) What is the thread pitch on the inlet/outlet of those valves?

They are 1/4" x 40 both ends

4) Just making sure - CSK is countersink right?

Yep

5) 'zeenipple'  :lolb:

 I'm saying nothing  :-X

For external threading - what should the rod be turned down to before using the die? I thought there was a formula but can't find it.
Turning to 5/16 for a 5/16 die did not go well. I had to shave a few thou off.
Now it could be that my measurement was off or that the die needs adjusting.
Which brings up another...how does one go about adjusting a die?

5/16" thread should go straight onto 5/16" bar, did you open te die up a little



One other thing, usual convention is to have those 4 studs that mount the fitting to the valve chest cover at 45deg.

And another thing, don't forget to slip the nuts onto the pipe before you solder on the nipples

Alibre part file attached

Offline zeeprogrammer

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Re: Monitor Steam Engine
« Reply #71 on: December 31, 2015, 04:21:15 PM »
Thanks Jason.

I didn't touch the die adjustment. Is there a procedure for doing that accurately? Perhaps find an existing thread and adjust until cuts or is tight?

Drawing shows the studs at 90deg but no problem to put at 45deg.

And another thing, don't forget to slip the nuts onto the pipe before you solder on the nipples

 ;D

Bob- good comment. I don't know if Vince is/will be running only on air.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Jasonb

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Re: Monitor Steam Engine
« Reply #72 on: December 31, 2015, 04:29:30 PM »
Usual way is to make your nut first as you can't adjust the tap and then cut the male thread to suit

Offline Jo

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Re: Monitor Steam Engine
« Reply #73 on: December 31, 2015, 04:49:47 PM »
Hi Zee, having had a play with your nipple  ::) I see you are still learning Alibre  :)

Have you considered drawing a partial cross section of the part and then revolving it?

Jo
« Last Edit: December 31, 2015, 04:54:48 PM by Jo »
Enjoyment is more important than achievement.

Offline Jasonb

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Re: Monitor Steam Engine
« Reply #74 on: December 31, 2015, 04:57:44 PM »
On a simple part like that I often find it as quick to just do a few extrusions as though you were making the part. Also simple to just alter one of the extrusions to draw a similar nipple for another size of pipe.

BTW did you understand the dimensions :LittleDevil:

J

PS your Cubify is no good to us

 

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