Author Topic: The dynamo and the tu-tu  (Read 31139 times)

Online steamer

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Re: The dynamo and the tu-tu
« Reply #30 on: February 09, 2014, 08:03:09 PM »
Zeee!

Looks great!   Right on the button!

Glad to read your posts too!....been too long!

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline b.lindsey

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Re: The dynamo and the tu-tu
« Reply #31 on: February 09, 2014, 08:37:28 PM »
You are moving right along Carl. Sorry about the drill but at least you got it out without damage. Always fun to follow your builds and even if your tu-tu isn't showing, your experience is and that's nice to see as well!!

Bill

Offline mklotz

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Re: The dynamo and the tu-tu
« Reply #32 on: February 09, 2014, 08:47:22 PM »
Here's hoping you can get the hole in the other end bell aligned with this one so the armature doesn't bind when it rotates.

I wasn't completely clear in my previous post but I would have drilled and tapped for all the end bell securing bolts before drilling for the bearings.  (I would also have provided witness marks so each end bell could be restored to its original location.)  Then my procedure would drill both bearing holes at once, aligned to the body centerline.
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Offline zeeprogrammer

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Re: The dynamo and the tu-tu
« Reply #33 on: February 09, 2014, 10:07:01 PM »
Thanks Bill.

Yeah Marv. That was an approach I'd considered but I had no confidence I'd even get close to aligning the holes. (Nor did I have a long enough drill bit). I don't know if it matters if I drilled the mounting holes first or not.

Witness marks will be made to identify which end a bell is for. But it may not really be necessary. The bells fit snugly in the frame with no slop. If I put the bell back on the right end of the frame and the holes don't match...it's a simple matter to rotate until they do. Even if the bell is on the wrong end...there's probably enough slop in the mounts and if not...just swap ends.

I guess all of this depends on how well I centered on the bore before clamping the bells on for drilling reaming.
Not sure how things may be bad if the bore isn't straight and square to the faced bed frame. I suppose the shaft may bind if the bushings are not true.

So excellent...we're getting set up for either...

"I should've listened to Marv" or "I lucked out"  ;D
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fcheslop

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Re: The dynamo and the tu-tu
« Reply #34 on: February 09, 2014, 10:44:35 PM »
If it should bind .Would an eccentric bush help or a self aligning bearing
Just a thought
Good luck

Offline mklotz

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Re: The dynamo and the tu-tu
« Reply #35 on: February 09, 2014, 10:51:18 PM »

So excellent...we're getting set up for either...

"I should've listened to Marv" or "I lucked out"  ;D

If it's the former I'll go as easy on you as I have in the past.  Depend on  it.
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Offline zeeprogrammer

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Re: The dynamo and the tu-tu
« Reply #36 on: February 09, 2014, 11:02:15 PM »

So excellent...we're getting set up for either...

"I should've listened to Marv" or "I lucked out"  ;D

If it's the former I'll go as easy on you as I have in the past.  Depend on  it.

I will have to.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline Alan Haisley

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Re: The dynamo and the tu-tu
« Reply #37 on: February 10, 2014, 03:23:18 AM »
Fingers crossed that the armature comes out centered and non-binding.
Alan
Near Raleigh, NC, USA

Offline Doc

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Re: The dynamo and the tu-tu
« Reply #38 on: February 10, 2014, 03:38:27 PM »
Nice job Carl!

I had been thinking about something like this for one of my steamers to set up a display. Once I retire I think I'm going to hit a few shows. They have been asking me to show at the local show but right now just can't find the time.
 Anyway keep up the good work it looking good.

Offline zeeprogrammer

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Re: The dynamo and the tu-tu
« Reply #39 on: February 10, 2014, 11:12:19 PM »
Thanks guys.

Going to order some drill bits tonight. I was going to run down to the hardware store...but why brave the ice and snow? Let some other poor soul who gets paid for it do it for me.
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Offline Rustkolector

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Re: The dynamo and the tu-tu
« Reply #40 on: February 11, 2014, 05:12:55 AM »
Zee,
Sorry I am late to this thread. I have built two of these generators. Best way I found was to clamp the end bells in the 3 jaw by the center bearing boss. Run the tailstock up against it to square it up if necessary. Turn the centering step on the end bells that centers them in the machined bore in the frame. Close fit needed. Then drill, bore, and ream the bearing bores. You can probably skip the boring step, but I didn't. Drill the four mounting bolt holes in each end bell, and then transfer punch holes to the frame. 

One note of caution. My first generator build 5 years ago went well and it has about 80-90 hours on it with no problems. Second one done recently didn't go as well. The Oilite bushing OD is oversized for an interference fit with the nominal bore diameter in the drawings. The bushing ID didn't crush down enough resulting in too much armature shaft clearance. When testing it as a motor, the armature shaft chattered in the bushings at various speeds. I thought I could keep it running outside the chattering RPM ranges but no luck. The shaft scores quickly. PM replaced the bushings and armature, but clearance was still too great and it chattered again. I replaced the bushings with RC sealed ball bearings. All is well now. Use larger pulley diameters rather than increased tension to prevent any drive belt slippage. 

Jeff

Offline zeeprogrammer

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Re: The dynamo and the tu-tu
« Reply #41 on: February 11, 2014, 11:26:44 AM »
Thanks Jeff.

I had tried holding the bells by the boss with the 3-jaw but was worried about having enough to hold onto. I wish I'd thought about using the tailstock to square it. I had indicated but that was an iffy process. The other reason I wasn't too sure about holding the boss was whether the casting of it was centered well enough. I'd come across (somewhere) some comments about it not necessarily being so. So as you saw, I used a 4-jaw and indicated the rim.

Several months ago I'd mentioned doing this and got suggestions to use ball bearings. But I don't expect to run this much more than  "yay it works" and decided to go stock.

Good tip on the pulley. Thanks.
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Offline arnoldb

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Re: The dynamo and the tu-tu
« Reply #42 on: February 11, 2014, 05:53:36 PM »
Another latecomer - It's REALLY good to see you back in the shop Zee  ;D

Can't offer much advice with castings, so I'll just be along for the joyride.

Kind regards, Arnold
Building an engine takes Patience, Planning, Preparation and Machining.
Procrastination is nearly the same, but it precludes machining.
Thus, an engine will only be built once the procrastination stops and the machining begins!

Offline zeeprogrammer

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Re: The dynamo and the tu-tu
« Reply #43 on: February 11, 2014, 11:27:46 PM »
Thanks Arnold.

And now for something entirely different...


 :cussing: :cussing: :cussing:
 :rant: :rant: :rant:
I broke down and went to my favorite hardware store.
IT'S OUT OF BUSINESS!!!
Geeeaaaaaahhhhh!!!
 :'( :'( :'(
The one place I could find little tidbits - drill bits of unknown sizes, bolts and nuts of all sizes and types...both metric and Imperial.
Grub screws! I could get grub screws there!
 :'( :'( :'(
A sad sad day.
I sure hope it wasn't my weak patronage that put them under.

Hm...I see that a 5/64" bit is 0.0781 and a #47 is 0.0785. Hm...
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline mklotz

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Re: The dynamo and the tu-tu
« Reply #44 on: February 11, 2014, 11:36:46 PM »

Hm...I see that a 5/64" bit is 0.0781 and a #47 is 0.0785. Hm...

And both are damn close to 2 mm = 0.07874"
---
Regards, Marv


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