Bone Works

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Peter Butler
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Re: Bone Works

Post by Peter Butler » Thu Aug 20, 2020 10:08 am

I was reluctant to mention the use of glass as it is not the easiest material to cut accurately. Being a picture framer (retired) I have been cutting glass for years and there is a skill involved to get clean edges and precise measurements, certainly not a simple as cutting styrene.
A handy trick to know is to use White Spirit (Turps) on your cutting tool to ensure a good lubrication of the wheel. Also, NEVER go over the same cut twice, this will damage the wheel beyond use.
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ge_rik
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Re: Bone Works

Post by ge_rik » Thu Aug 20, 2020 12:32 pm

Peter Butler wrote:
Thu Aug 20, 2020 10:08 am
I was reluctant to mention the use of glass as it is not the easiest material to cut accurately. Being a picture framer (retired) I have been cutting glass for years and there is a skill involved to get clean edges and precise measurements, certainly not a simple as cutting styrene.
A handy trick to know is to use White Spirit (Turps) on your cutting tool to ensure a good lubrication of the wheel. Also, NEVER go over the same cut twice, this will damage the wheel beyond use.
That's useful info, thanks Peter.
One of my holiday jobs many (many) years ago was in a builders' merchants. I was taught how to cut large sheets of glass on a flat table. We placed a couple of matches under the scored cut line and applied gentle pressure either side.

I must admit that cutting glass was probably my least favourite job, closely followed by unloading paving slabs by hand from the delivery lorry.

Rik
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Re: Bone Works

Post by ge_rik » Tue Aug 25, 2020 6:06 pm

Still working on the roof of the Boneworks but, while waiting for the ridge tiles to print out, I put together the beam engine.
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I haven't bothered too much with the finish as it will be located inside the engine house and so only partially visible. Of course it still needs painting but I wanted to see how it worked with a motor. It's still a bit too fast, so I'm going to investigate slowing it down. I have one of those miniature geared motors so might remodel the motor housing to take it instead of the bog standard 3v motor.

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Rik
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Re: Bone Works

Post by philipy » Tue Aug 25, 2020 6:20 pm

Thats good Rik.
As you say, a bit fast, at that speed it lacks the 'majesty' of the real thing. If you are using a 3v motor, what is it like at 1.5v?

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Re: Bone Works

Post by ge_rik » Tue Aug 25, 2020 9:42 pm

philipy wrote:
Tue Aug 25, 2020 6:20 pm
Thats good Rik.
As you say, a bit fast, at that speed it lacks the 'majesty' of the real thing. If you are using a 3v motor, what is it like at 1.5v?
Hi Philip
I'm powering the 3v motor from a single 1.2v rechargeable cell ..... so not got much leeway left.

Rik
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Old Man Aaron
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Re: Bone Works

Post by Old Man Aaron » Wed Aug 26, 2020 12:29 am

ge_rik wrote:
Thu Aug 20, 2020 12:32 pm
That's useful info, thanks Peter.
Seconded. I'll bet the edges of my cut pieces were a bit painful to look at with experienced eyes. :lol:

Rik, that engine's coming up nicely. Must agree regarding the speed. I've seen videos of live steam beam engines running on air at such speed, that one half-expects them to fly apart. Looks very wrong, but I suppose is one way to test the build quality! :bom:
Looking forward to seeing your revised drive arrangement.

Regards,
Aaron
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Re: Bone Works

Post by gregh » Wed Aug 26, 2020 6:25 am

stupid question time...
I assume that big round vertical thing is the cylinder. If so how come it has a big hole in the side?

RE the motor speed, if the gearbox idea is too hard, how about an electronic solution? An esc or PWM using a Picaxe.
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Re: Bone Works

Post by ge_rik » Wed Aug 26, 2020 8:05 am

gregh wrote:
Wed Aug 26, 2020 6:25 am
stupid question time...
I assume that big round vertical thing is the cylinder. If so how come it has a big hole in the side?

RE the motor speed, if the gearbox idea is too hard, how about an electronic solution? An esc or PWM using a Picaxe.
Yup, it is the cylinder. The designer of the kit seemed to think it was a good idea to make the cladding removable so people can see the piston going up and down. Not sure why.

I've sent off for a Pwm motor controller for £2.85, which seemed good value.

Rik
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Re: Bone Works

Post by philipy » Thu Aug 27, 2020 4:06 pm

gregh wrote:
Wed Aug 26, 2020 6:25 am
stupid question time...
I assume that big round vertical thing is the cylinder. If so how come it has a big hole in the side?

RE the motor speed, if the gearbox idea is too hard, how about an electronic solution? An esc or PWM using a Picaxe.
Rik,
I was just browsing Thingiverse and I noticed this comment on the beam engine, "Just for information, If you have an old Braun electric tooth brush laying around, the motor from it fits perfectly into this Beam Engine." Don't know if that might help?

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Re: Bone Works

Post by ge_rik » Fri Aug 28, 2020 8:25 am

philipy wrote:
Thu Aug 27, 2020 4:06 pm
Rik,
I was just browsing Thingiverse and I noticed this comment on the beam engine, "Just for information, If you have an old Braun electric tooth brush laying around, the motor from it fits perfectly into this Beam Engine." Don't know if that might help?
Thanks Philip
I tinkered around with one of those tiny geared motors (I bought three of them a few years ago - just in case). I tried connecting it via a pulley to the end of the crankshaft but struggled to get the tension on the belt right - too tight and the friction on the shaft increased too much, too loose and it slipped.

In the end, I drew and printed a cradle to hold the motor inside the original motor clip. The speed from the motor shaft alone was too slow, so I found a wheel off a cheap plastic toy which gives a far better speed when bearing on the flywheel. I've had to move the position of the motor mount but I'm now much happier with the speed - slow and ponderous. I might increase the speed a little by adding another cell and then use the PWM controller to fine tune it.

I'm just painting the model, so will make a video when it's done.

Rik
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Re: Bone Works

Post by Lonsdaler » Fri Aug 28, 2020 7:07 pm

What about a clock motor Rik? You might actually need to gear it up a bit!
https://www.ebay.co.uk/itm/154029066295
Phil

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Re: Bone Works

Post by ge_rik » Fri Aug 28, 2020 8:28 pm

Lonsdaler wrote:
Fri Aug 28, 2020 7:07 pm
What about a clock motor Rik? You might actually need to gear it up a bit!
https://www.ebay.co.uk/itm/154029066295
Thanks for the suggestion, Phil, but I've now sorted it out with the miniature geared motor. The ex-toy-car wheel I'm using as friction drive on the flywheel isn't the most elegant solution but I can hid that easily with a strategically placed barrel or step-ladder.

I think the speed is much more appropriate and with the PWM controller can tweak it. All I need to do now is finish the boneworks so it can have a home .....
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Peter Butler
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Re: Bone Works

Post by Peter Butler » Fri Aug 28, 2020 8:47 pm

Well done Rik, that has worked out OK with the new control system. Printing marks will go unnoticed once in position, perhaps some steam sounds could help to add atmosphere?
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Re: Bone Works

Post by philipy » Fri Aug 28, 2020 8:51 pm

Lovely Rik, well done.
FWIW, I think the speed looks about right at the beginning, before the big hand in the sky twiddled the knob.

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Re: Bone Works

Post by ge_rik » Fri Aug 28, 2020 10:06 pm

philipy wrote:
Fri Aug 28, 2020 8:51 pm
FWIW, I think the speed looks about right at the beginning, before the big hand in the sky twiddled the knob.
I did wonder, still it's comforting to know I have a knob to twiddle when I get the urge..... 🤔

Peter Butler wrote:
Fri Aug 28, 2020 8:47 pm
........, perhaps some steam sounds could help to add atmosphere?
I was considering adding a sound module. I have one of those MP3 player cubes to spare. Just need to find the right sounds. If it's open, I might take a trip to the boneworks in Stoke - just need to find out when they're next firing up their engine...

Rik
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