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- R.C. Mobile Crane - In 1:43 Scale -
 Moderated by: W C Greene Page:  First Page Previous Page  1  2  3  Next Page Last Page  
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 Posted: Fri Dec 9th, 2016 12:57 am
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Cor V
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i have a potentional victema nice crane from speccast
you can find loads off small motors for winches, or use a servo for it
Cor



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 Posted: Sat Dec 10th, 2016 01:10 am
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bobquincy
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This place
http://www.gizmoszone.com/shopping/agora.cgi?product=Gearmotor&user4=68series;ppinc=1g
has some small motors with a lot of gear reduction, down to 25 rpm and even one at 14 rpm
http://www.gizmoszone.com/shopping/agora.cgi?product=Gearmotor&user4=68series;ppinc=1g



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 Posted: Sat Dec 10th, 2016 01:25 am
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Cor V
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http://www.ebay.com/itm/DC-6V-30RPM-Micro-Speed-Reduction-Gear-Motor-with-Metal-Gearbox-Wheel-Shaft-/111742307756?hash=item1a045c4dac:g:840AAOSwI-BWOXz2
Cor



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 Posted: Sat Dec 10th, 2016 09:36 pm
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dan3192
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https://www.pololu.com/category/51/pololu-metal-gearmotors

https://www.pololu.com/product/989

Dan

Last edited on Sat Dec 10th, 2016 09:45 pm by dan3192

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 Posted: Sat Jan 14th, 2017 10:49 pm
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W C Greene
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OK then, let's see some more operating cranes, etc. How about an operating crane (Brownhoist) that not only works but is capable of running by itself from job to job. I have seen such cranes do "double duty" as switch engines-in a pinch I suppose. Might make for some interesting operations on the layout!

Woodie



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 Posted: Sun Mar 19th, 2017 03:50 pm
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Giles
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The running gears were the same type of gear motor (Polulu have better starting characteristics than the cheap eBay ones) driving through a pair of plastic bevel gears to the back axle.

I finally built myself a four-joystick transmitter to drive this thing, based around a DelTang TX. It now handles very well and reliably.

http://www.youtube.com/watch?v=dtmj2a92sJw



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 Posted: Mon Mar 20th, 2017 04:43 am
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Rod Hutchinson
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Giles wrote: I finally built myself a four-joystick transmitter to drive this thing, based around a DelTang TX.
Hi Giles.  Can you tell me a little bit about how you built the joystick transmitter using a Deltang TX?



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 Posted: Mon Mar 20th, 2017 05:43 am
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Tony Walsham
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Hi Rod. Given that a Deltang Tx module is more or less the same as any DSM2 stick radio innards, you would probably be better off simply buying any DSM2 stick radio.
The most difficult thing to build are the gimbals that connect the sticks to the controlling pots.



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 Posted: Mon Mar 20th, 2017 10:45 am
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Rod Hutchinson
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Tony Walsham wrote: Hi Rod. Given that a Deltang Tx module is more or less the same as any DSM2 stick radio innards, you would probably be better off simply buying any DSM2 stick radio.
The most difficult thing to build are the gimbals that connect the sticks to the controlling pots.

Tony, I am only familiar with DT tx / rx.  Some DT rx models can be controlled useing a DX3 tx.  I am going to put R/C into some 1:87 vehicles.

Can you tell me anything about DX3 txs'?
How would I choose a DX3 transmitter over a DSM2 stick transmitter?

Last edited on Mon Mar 20th, 2017 10:46 am by Rod Hutchinson



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 Posted: Mon Mar 20th, 2017 01:10 pm
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Giles
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Hi Rod,



The transmitter is based on a standard Deltang 6 channel (I think!) job, which Andy at Micron had built up for me as a temporary TX, as he was going to build a special four-stick (plus one knob) one for me. This temporary TX was simply a series of knobs, which was exceedingly difficult to 'drive' without causing the crane damage through over-runs.



However, Andy found that (all) the joysticks he planned on using were not accurate enough and wouldn't do the job - so he regretfully declined to take it further.



I, with the innocence of ignorance, and the drive of necessity, had to make it work.



The solution was to use 'Thumb joysticks' (which Andy was intending) which used as they come didn't 'zero', and things were in motion when they shouldn't be. I solved that by the expediency of (channel by channel) removing the pot from the side of the assembly, filing off all the locating lugs, putting the pot back on, and rotating it until it 'zeroed' and all motion stopped, and glueing it back on in that position.

Crude, but eventually effective....



The top two sticks operate the truck, and the bottom two operate the three crane functions, and the knob (lower centre) operates the out-riggers.


Last edited on Mon Mar 20th, 2017 01:19 pm by Giles



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Giles

The Loop. 0-16.5
http://www.youtube.com/watch?v=1FB2lTF4t4M&feature=plcp&context=C3775db8UDOEgsToPDskI_j5g3O_927OWTefW3AUU-
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