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Jaemus
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Joined: 01 Apr 2009
Posts: 2674
Location: NSW


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I usually opt for 550's because I have lots of spares, but nothing against 775 if the gearbox is up to it
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Post Sun May 24, 2015 11:05 pm 
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miles&Jules
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Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD


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how much are dewalts? They are about $50 second hand aren't they?
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Post Mon May 25, 2015 11:37 pm 
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Knightrous
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Joined: 15 Jun 2004
Posts: 8511
Location: NSW


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I've been scoring my Dewalt motors for $40-60 (depends on exchange rate/shipping) from a few eBay sellers.
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Post Tue May 26, 2015 7:46 am 
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Knightrous
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Joined: 15 Jun 2004
Posts: 8511
Location: NSW


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quote:
Originally posted by Knightrous:
Initial inquires are looking to be around $60-65 landed without a motor (just matched pinion).


We have 20 units in bound, price will be $70ea, price breaks for bigger orders.
Will have an update on the motor situation shortly.
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Post Fri May 29, 2015 1:27 pm 
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maddox



Joined: 21 Dec 2006
Posts: 786
Location: Belgium


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€100 for 2, without P&P or import tax.

Tempting. Will ask the team about ordering 2 sets.

Post Fri May 29, 2015 2:48 pm 
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Philip
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Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane


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What ratio(s) did you get? What are the measurements? Does it need a support bearing?
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Post Sat May 30, 2015 6:36 am 
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seanet1310



Joined: 08 Nov 2006
Posts: 1265
Location: Adelaide


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to continue on from Philip's questions, with the largest motor you are thinking of using what are the dimentions looking like as a rough estiamte.
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Post Sun May 31, 2015 8:16 pm 
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shakesc



Joined: 14 May 2012
Posts: 62
Location: UK


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sounds an interesting development
Looking forward to seeing more details

Post Sun May 31, 2015 8:53 pm 
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seanet1310



Joined: 08 Nov 2006
Posts: 1265
Location: Adelaide


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A link to the page on the BotBitz site.
Phil, it has the dimensions of the gearbox.
http://botbitz.com.au/index.php?route=product/product&path=59&product_id=61
3 inch shaft would need a support bearing I would imagine.
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Post Wed Jun 03, 2015 9:32 pm 
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Rotwang
Experienced Roboteer


Joined: 15 Jun 2004
Posts: 1589
Location: Vic


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Just wondering if anyone has used one of these MY1084 24V 250W gear motors with a BotBitz controller?
I have blown various controllers in the past, quick reverses seem to cause the problem.
They have rare earth magnets and I suspect they induce some sort of voltage that most controllers don’t like.

http://edge.rit.edu/edge/P14473/public/Photo%20Gallery/My1018%20Motor%20Spec%20Sheet.jpg


If not I will buy some BB-85a’s and see what happens. Smile
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Post Sun Aug 02, 2015 6:26 pm 
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marto
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Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


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Aaron had one on farm boys lifter. Seemed to go ok.
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Post Sun Aug 02, 2015 7:13 pm 
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Rotwang
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Joined: 15 Jun 2004
Posts: 1589
Location: Vic


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Thanks for the quick reply; unfortunately when I looked at Aarons build thread just now it appears that he has used the regular ferrite version.

Not to worry, my turn to do a little research.
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Post Sun Aug 02, 2015 8:10 pm 
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andrew



Joined: 16 Jun 2004
Posts: 3110
Location: Castle Hill, Sydney. N.S.W


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I used one in my fail sportsman robot. Zero issues.
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Post Sun Aug 02, 2015 8:22 pm 
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Knightrous
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Joined: 15 Jun 2004
Posts: 8511
Location: NSW


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The recent most incarnation of Farmboy was to use a 450W version of the MY1018Z motor, however they were not in stock. For a drive train, I'm not sure how they will go since they will probably have some nasty voltage spikes, but considering the voltage spikes the winch motors can throw at times and the 85A's have handed them, I've got some confidence that they will work.
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Post Mon Aug 03, 2015 8:02 am 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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Could you use a bidirectional TVS diode with a breakdown voltage around 26 - 28V to clip spikes from the motor?
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Post Mon Aug 03, 2015 8:16 am 
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