Graupner motors

[razerdave]

Re: Graupner motors

Right. I am going to try and make this as clear as possible, my previous post obviously wasn't.

will i need more than 85amp?
No. 85A is plenty to take 4 drill motors running on 18v.


I'm thinking of either dewalt hammer drills (which i found out that the motors of the b&q 14.4v one would be fine and i.would just need a new gearbox)

Dewalt motors are odd shapes. It is very unlikely they will fit the cheap gearbox.

Adding other motor to another gearbox is complicating things (trust me, I've had to because I had no choice), and its also pointless when you can buy a ready made unit (Argos/B&Q normal drills)


maybe graupner motors

Not yet. Get a working robot before you upgrade.

doubt they will pull over 85amp but i could always get a 190-200amp hobbyking http://www.hobbyking.com/hobbyking/stor ... 5FESC.html
i would need 4 i think
and i would have to hack them brushed to brushless

These ESC's are for brushless motors. YOU cannot hack them to become brushed motor ESC's. AFAIK there is only one roboteer that can, and he is a lot smarter than you (and me for that matter).

As far as speed controllers are concerned, buy a speed controller that is SUGGESTED to you. We suggest them because they have been proven in combat.

It is not a good idea to buy something, blow it up and then buy one that does work. Better to go with what is known to work already.

The Botbitz 85A controllers (2 of) will run 4 standard drills at 18v without any problems.
If you plan to use 2, 12v drills at 18v, the 25A will do fine.

I hope this helps.

[archie2000]

Re: Graupner motors

i completely understand
i.will build a drill motor robot and after kidiminster i may.change the motors.
IS THAT CLEAR.
i am following your advice, but if i waste £80-90 on electronize and then have to buy botbitz that's an expensive waste.
I'm sorry but i have said its drill motors all the way for my first.
that's what you said isn't it.
anyways back to my question.
are 4 drill motors more powerful than 2 speed 900s?
i would only use graupners.and that my second.
please try and understand that cos i understand you lot aswel

[maddox10]

Re: Graupner motors

i completely understand
anyways back to my question.
are 4 drill motors more powerful than 2 speed 900s?

If you would have understood, you wouldn't have asked this question.

I'll try again.

Depends on drills. Some drills -on paper- will draw more power, meaning those are more powerfull.

On the other hand, motors have a few things that make them better or not.

As a rule, bigger diameter and/or stronger magnets equals more torque for a given volt/amp draw. But a lower RPM per volt.
A speed 900 has a diameter of 50mm+, a cheap brand of drill will have a motordiameter of 36mm. Just to demonstrate. A 900 weights 660 grams+, a cheap drillmotor with gearbox weights less than 600 grams.

Build quality is another matter. You can imagine a £12 drill will have less quality materials than a simular sized drill from a quality brand.

And of course, you can use the most powerfull motors in a machine, but if the shape is wrong, it doesn't matter.
A robot with Bosch 35 drives getting under will outperform a 6 Speed 900 propelled monster.

[archie2000]

Re: Graupner motors

thanks maddox thats great.
i now have all my information for my build.
i will stop asking silly questions.
i will talk to my parents about what they think.
i will get a good design.
i will use simple and tested components.
i will take it to robots live in october.
i will learn something form the experience.
i will ask hopefully less stupid questions.
i will follow advice on how to improve my drill bot.
thanks everyone.
only problem now is speed controll.
botbitz 85amp would be great for my drill bot and when i improve it.
but my mum and dad say ordering from abroad is a waste of money on tax and stuff like that.
(if it was down to me i would have about 5 featherweights now)
another option (which dave didnt reccommend so its probarbly bad) is get the vantec and take off the heat sink, because with it it weighs 1.1kg.
satans mutt used a vantec/roboteq (sorry i get really confused with those two)
but if i can i will get botbitz.

[razerdave]

Re: Graupner motors

There are 2 types of Vantecs, there is the standard one and a mini one. Satan's Mutt (and I think Ploughbot) use the mini version designed for High power FW's/American LW's. The Vantec for sale is the HW version.

The case/heatsink is on most speedo for a reason, it's not advised to remove it.

I suggested the botbitz 85a controllers for 2 reasons: 1: If you bought them now then you wouldn't need to upgrade your speedos if and when you upgrade to Speed 900's, and 2: I don't like Electronize speedos :P. I've seen a fair few broken ones with the relay broken, and their response is far too slow for my liking.

Electronize will drive 4 drills (see Tormenta), but to save a bit of money in the long run to buy botbitz 85A ones. Just my opinion.

Oh, BTW, the shipping and tax ordering from Australia (botbitz) is far cheaper than ordering from the states for whatever reason.

[archie2000]

Re: Graupner motors

i have a CAD of what i want.

[typhoon_driver]

Re: Graupner motors

DO NOT REMOVE THE HEATSINK FROM A VANTEC

From the purely practical side it would be a pain in the arse as it is attached with a good few dozen bolts and secondly it will dramatically reduce the current handling capability of the controller. I also wouldn't advise a vantec as your first speed controller as they are relatively delicate or rather they don't handle being connected up wrong well

O and the issue on tax is a bit of a mute point as you are paying tax on everything you buy in the UK anyway

[archie2000]

Re: Graupner motors

i have a CAD of what i want.

edit:
cheers dave botbitz it is (hopefully)

[archie2000]

Re: Graupner motors

thanks dave and gary.
if i dont get the botbitz over the summer holiday i will hopefully get them for xmas

[Mouldy]

Re: Graupner motors

Botbitz tz85a's back in stock as of yesterday. I've just ordered another two.

Also.... Why are people suggesting this kid buys standard drills? Save your self hassle.. Buy gimpsons with wheels attached.... Or you won't know how to mount your motors.


Shopping list;

2 off botbitz tz85a's
4 off gimpsons With wheels.

Buy these parts... When they arrive, ask questions later.

[razerdave]

Re: Graupner motors

Archie likes to do things on the cheap side, hence the recommendation of standard drills.

[Ellis]

Re: Graupner motors

Botbitz tz85a's back in stock as of yesterday. I've just ordered another two.

Also.... Why are people suggesting this kid buys standard drills? Save your self hassle.. Buy gimpsons with wheels attached.... Or you won't know how to mount your motors.


Shopping list;

2 off botbitz tz85a's
4 off gimpsons With wheels.

Buy these parts... When they arrive, ask questions later.

I think drills were being suggested (by myself included) because they're cheap as chips and they represent practical options, over bazillion watt gearbox combos or custom speed 900 setups. Plus, most if not all of use here have experience with them.

By all means use Gimsons, though drills aren't exactly hard to mount. It is true that a Gimson's gearbox is likely to last longer, but from what I gather, you intend to replace the motors immediately anyway.

[archie2000]

Re: Graupner motors

im going to try and make mounts that look like gimson mounts for the drill motors.
thanks for the concern dave.m but i think i can make mounts for myself (otherwise i will learn nothing)
you know me too well dave.w

[maddox10]

Re: Graupner motors

Archie likes to do things on the cheap side, hence the recommendation of standard drills.

Could be, but with Dave's suggestion it's plug and play concerning driivetrain. Avoids buying a lot of tools straigth away.

Otherwise you could end up like some roboteers, with a full workshop , costing 1000's...

[archie2000]

Re: Graupner motors

my dad has lots of experience with these things and has 3 rooms in the celar full of bits i dont know what they do.
i doubt i will struggle with armour building or mounts as the 'workshop' already has cost quite a bit probarbly