RC Mower

Introductions, general chit chat and off-topic banter.
User avatar
Adverse Effects
Senior Member
Posts: 1033
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

RC Mower

Post by Adverse Effects » Sat, 14 Jan 2017, 05:27

ok before i spend more time looking something occurred to me
are you going to direct drive the wheels or chain drive them

because ether way you are going to have to turn the motors and the wheels as a unit

also do you know if you can get hubs for those motors? for the wheels? because there splined axels

if your going all wheel drive all wheel stear i would use something like these
2X 4.10 - 4" Inch Wheel Rim + Tyre $63.99

if you are going 2 wheel drive i would use 2 of the above and 2 of these
2x 145/70- 6" Inch Wheel Tyre $62.90

4 wheel drive you should be good with 100mm wide on all 4 for grip

also i dont see a disengage level to make them free wheel how are you going to move it if something go's wrong with the drive system?

umm why did you over look this motor?
Worm Drive Motor 12V/24V 200W, 180 RPM, 20Nm Torque even tho it says there is no 24V in stock i think you will find the 24V is the same as the 12V just gives more speed and torque just shoot them a email to ask

granted it dosent have a disengage level but you can mount it to the down arm and hang a wheel directly off it similar to the same way my ones mount

by the way dont forget to add the shipping 4 of thos motors you linked to would cost almost $40 to ship to me in a big city may be more for up there

i am sure i will think of more things but i am over heated and tired at the moment from having spent over 4 hours fighting with bigpond / telstra

User avatar
EV2Go
Senior Member
Posts: 2058
Joined: Wed, 16 Jul 2008, 00:21
Real Name: Paul
Location: Brisbane 1963

RC Mower

Post by EV2Go » Sat, 14 Jan 2017, 07:36

If I used these I would direct drive as they already have a spindle ready to go and gear reduction done.

Image

I have looked around and there seems to be quite a few splined hubs around that something is bound to fit.

And if I went that direction I would probably find some small four bolt hole rims and tyres, I saw some the other night.

There are bolt holes in the body of these ones so I foresee the motors bolting to some kind of rotating upright tube.

Yes would be nice to have a redundancy plan but I'm sure I would work something out in the case of failure.

The Controller that go with seem fairly smart to provide things like braking and reverse.

I'm only 25 minute away from where I used to live so I'm hardly in the sticks, besides I've been told Ipswich is a city (although I am yet to see signs of it) :D

Last edited by EV2Go on Fri, 13 Jan 2017, 20:50, edited 1 time in total.

User avatar
Richo
Senior Member
Posts: 3349
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

RC Mower

Post by Richo » Mon, 16 Jan 2017, 20:53

EV2Go wrote:This is an incomplete idea of what I have in mind

Image
Adverse Effects wrote: So if you look at his pic you will see clearly 3 blades not to mention we have been discussing this fore about a week b4 this thread in emails


Yeah the picture isn't "clear".
It shows one big motor for the blade.
Not too sure how anyone was suppose to interpret this as a three blade mower.

I've built that bridge...
Image
Help prevent road rage - get outta my way! Blasphemy is a swear word. Magnetic North is a south Pole.

User avatar
Richo
Senior Member
Posts: 3349
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

RC Mower

Post by Richo » Mon, 16 Jan 2017, 21:05

Adverse Effects wrote: umm why did you over look this motor?
Worm Drive Motor 12V/24V 200W, 180 RPM, 20Nm Torque


They're the golf cart motor+box right.
I butchered one of those and coupled it to a 500W motor.
That was just enough to get it around the golf course with the golfer riding it.

I guess ~120kg on smoothly cut grass.

So you'd have to go AWD for rough terrain and 300kg.
Help prevent road rage - get outta my way! Blasphemy is a swear word. Magnetic North is a south Pole.

User avatar
Adverse Effects
Senior Member
Posts: 1033
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

RC Mower

Post by Adverse Effects » Mon, 16 Jan 2017, 22:17

Richo wrote:
Adverse Effects wrote: So if you look at his pic you will see clearly 3 blades not to mention we have been discussing this fore about a week b4 this thread in emails


Yeah the picture isn't "clear".
It shows one big motor for the blade.
Not too sure how anyone was suppose to interpret this as a three blade mower.

I've built that bridge...
Image


hmmm

Image

2 posts above you saying i was changing the design

User avatar
EV2Go
Senior Member
Posts: 2058
Joined: Wed, 16 Jul 2008, 00:21
Real Name: Paul
Location: Brisbane 1963

RC Mower

Post by EV2Go » Tue, 17 Jan 2017, 00:28

Just to set the record straight. It makes sense to go AWD if possible and it seems it is (I wouldn't use the method shown, that is for illustration purposes only, as it was quick to draw).

I would like to go all electric to power the mower blades, but I think that is a battle for another day. So for now it's petrol for convenience and potentially a generator for the wheel batteries.

Here are some of the block photo when we first got it. It's not perfectly flat but it will get some work before construction. Although it will never be flat.

Image
Image
Image
Image
Image
Image

User avatar
Adverse Effects
Senior Member
Posts: 1033
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

RC Mower

Post by Adverse Effects » Tue, 17 Jan 2017, 00:50

so when is the BIG billabong be going in so you can stock it with fish and yabby's/crawfish

*thinks of sitting back in the late arvo with a drink and a rod*

User avatar
Adverse Effects
Senior Member
Posts: 1033
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

RC Mower

Post by Adverse Effects » Tue, 17 Jan 2017, 01:14

wow is that shed on your lot?

if so ! SCORE !

User avatar
EV2Go
Senior Member
Posts: 2058
Joined: Wed, 16 Jul 2008, 00:21
Real Name: Paul
Location: Brisbane 1963

RC Mower

Post by EV2Go » Tue, 17 Jan 2017, 02:26

Nope the shed is just on the next block. Picture 5 shows a drop off near the shed (neighbours shed is lower than my block). Picture 6 shows the other boundary (chain wire fence), so the main block is 70m deep by 20m wide. Picture 1,2,3 shows the ~40m long x 5m wide concrete driveway which is on my property. Picture 4 shows my front fence of main block and a small retaining wall will go in that low spot to build it up about 600mm.

Here's the view from the back balcony. The blue line is where there is a deep dry creek bed that goes around the back and side of the property stopping anyone from building out our view :D

Image
Image

User avatar
Richo
Senior Member
Posts: 3349
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

RC Mower

Post by Richo » Tue, 17 Jan 2017, 20:40

Image
Nice one Image
Sometimes when my grass gets that long I wish I had a combine harvester. Image
The mower just struggles.

I still don't think skid steer is an issue.
That is unless your trying to make it spin on the spot repeatedly.
Help prevent road rage - get outta my way! Blasphemy is a swear word. Magnetic North is a south Pole.

User avatar
Richo
Senior Member
Posts: 3349
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

RC Mower

Post by Richo » Tue, 17 Jan 2017, 20:46

Although this is not the one I saw where oversized wheels were bolted on it at least gives you an idea of how the wheel was bolted through the back plate.
https://endless-sphere.com/forums/viewt ... 35&t=81756

Image

Help prevent road rage - get outta my way! Blasphemy is a swear word. Magnetic North is a south Pole.

User avatar
EV2Go
Senior Member
Posts: 2058
Joined: Wed, 16 Jul 2008, 00:21
Real Name: Paul
Location: Brisbane 1963

RC Mower

Post by EV2Go » Wed, 18 Jan 2017, 01:08

Ok at least I now know what you are talking about when you mentioned a hover board, I was thinking back to the future but there are no wheels.

User avatar
EV2Go
Senior Member
Posts: 2058
Joined: Wed, 16 Jul 2008, 00:21
Real Name: Paul
Location: Brisbane 1963

RC Mower

Post by EV2Go » Wed, 18 Jan 2017, 01:10

Would wheel motors produce the same amount of torque as geared motors?

User avatar
Adverse Effects
Senior Member
Posts: 1033
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

RC Mower

Post by Adverse Effects » Wed, 18 Jan 2017, 02:33

EV2Go wrote: Would wheel motors produce the same amount of torque as geared motors?

no
that was simple

if you put a hub motor and ran it through a g-box or reduction drive yep but watt for watt no

User avatar
EV2Go
Senior Member
Posts: 2058
Joined: Wed, 16 Jul 2008, 00:21
Real Name: Paul
Location: Brisbane 1963

RC Mower

Post by EV2Go » Wed, 18 Jan 2017, 04:07

Well isn't torque over speed the goal here, I mean within reason... Would need it to go at least walking speed.

T1 Terry
Senior Member
Posts: 721
Joined: Thu, 30 Sep 2010, 20:11
Real Name: Terry Covill
Location: Mannum SA

RC Mower

Post by T1 Terry » Wed, 18 Jan 2017, 17:27

Will this be bump steer as in when it runs into something it reverses with steering turned till it hits something else, then forward straight?
or
embedded wire sensing steer where it reverses direction and steps sideways one mover width each time it senses the embedded wire
or
sitting back in the deck chair with cold beer in hand and a remote control and steering it that way?

T1 Terry
Green but want to learn

User avatar
Adverse Effects
Senior Member
Posts: 1033
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

RC Mower

Post by Adverse Effects » Wed, 18 Jan 2017, 19:32

option 3

User avatar
Richo
Senior Member
Posts: 3349
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

RC Mower

Post by Richo » Wed, 18 Jan 2017, 20:26

Adverse Effects wrote:no

Image

Agreed
Help prevent road rage - get outta my way! Blasphemy is a swear word. Magnetic North is a south Pole.

User avatar
Richo
Senior Member
Posts: 3349
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

RC Mower

Post by Richo » Wed, 18 Jan 2017, 20:42

EV2Go wrote: Ok at least I now know what you are talking about when you mentioned a hover board, I was thinking back to the future but there are no wheels.


Yeah I should have clarified that.
Hover board/balance board/balance wheel
They're the ones that the aeroplanes now don't allow on board and catch fire when you look at them Image

They have manufacturing issues that causes the casing to cut into the battery pack then catch fire when you charge them.
And the charger was deemed not usable in Oz as they weren't compliant.
That's why there's a few around 2nd hand.
Plus people use them a bit and then get board or just don't like them after a while (novelty factor).

They are rated for carrying ~130kg around at a bit faster than walking speeds.
So four would be 1400W(claimed) 260kg at walking speed.
So I'd think the torque is reasonable for a mower - assuming traction was met.

Image

Single sided axle, no gears, no pullies, awd...
I already have a bunch laying around with controllers.
Been meaning to get around to testing them Image
Help prevent road rage - get outta my way! Blasphemy is a swear word. Magnetic North is a south Pole.

User avatar
EV2Go
Senior Member
Posts: 2058
Joined: Wed, 16 Jul 2008, 00:21
Real Name: Paul
Location: Brisbane 1963

RC Mower

Post by EV2Go » Wed, 18 Jan 2017, 23:52

T1 Terry wrote: Will this be bump steer as in when it runs into something it reverses with steering turned till it hits something else, then forward straight?
or
embedded wire sensing steer where it reverses direction and steps sideways one mover width each time it senses the embedded wire
or
sitting back in the deck chair with cold beer in hand and a remote control and steering it that way?

T1 Terry

Adverse Effects wrote: option 3


Yep it may even be a lazy mans version of option three, where I mount cameras on the mower and sit inside on a comfy couch to drink that cold beer :D

I have a mate in England who is big into FPV helicopters and planes, and he has given me the skinny on the parts I need. A couple of hundred extra would make it a remote remote.

User avatar
EV2Go
Senior Member
Posts: 2058
Joined: Wed, 16 Jul 2008, 00:21
Real Name: Paul
Location: Brisbane 1963

RC Mower

Post by EV2Go » Thu, 19 Jan 2017, 00:00

Richo wrote: They are rated for carrying ~130kg around at a bit faster than walking speeds.
So four would be 1400W(claimed) 260kg at walking speed.
So I'd think the torque is reasonable for a mower - assuming traction was met.
But this is where I think Ivan is right about the traction. You can see the terrain from the photos, up some steepish slopes in places (and down) trying to cut through grass while moving forward, is a far cry from moving a person on a concrete path.

Apart from the additional weight (and 130kgs is probably a gross marketing exaggeration) the massive drag 2 or 3 blades cutting long grass would add, it really needs wide tyres and oodles of torque.

So perhaps 350w per wheel isn't enough?

User avatar
Adverse Effects
Senior Member
Posts: 1033
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

RC Mower

Post by Adverse Effects » Thu, 19 Jan 2017, 03:54

EV2Go wrote:
Richo wrote: They are rated for carrying ~130kg around at a bit faster than walking speeds.
So four would be 1400W(claimed) 260kg at walking speed.
So I'd think the torque is reasonable for a mower - assuming traction was met.
But this is where I think Ivan is right about the traction. You can see the terrain from the photos, up some steepish slopes in places (and down) trying to cut through grass while moving forward, is a far cry from moving a person on a concrete path.

Apart from the additional weight (and 130kgs is probably a gross marketing exaggeration) the massive drag 2 or 3 blades cutting long grass would add, it really needs wide tyres and oodles of torque.

So perhaps 350w per wheel isn't enough?


100 watts would be enough as long as its geared down enough but you lose some speed gearing it down that far

hence making it 200 to 350 watts and gearing it down to the final drive speed needed

User avatar
EV2Go
Senior Member
Posts: 2058
Joined: Wed, 16 Jul 2008, 00:21
Real Name: Paul
Location: Brisbane 1963

RC Mower

Post by EV2Go » Thu, 19 Jan 2017, 16:01

Ok I was on the right track to begin with. So I guess the only question that needs to be asked is external chain or internal gears. Gears would make more sense to me as they won't get grass in them. Or you mentioned a worm drive, any advantage of worm drive over gears?
Last edited by EV2Go on Thu, 19 Jan 2017, 05:02, edited 1 time in total.

User avatar
Richo
Senior Member
Posts: 3349
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

RC Mower

Post by Richo » Thu, 19 Jan 2017, 20:33

You "could" push gears not the worm drive.
The worm drive can get much higher ratios but probably not relevant for this application.
Help prevent road rage - get outta my way! Blasphemy is a swear word. Magnetic North is a south Pole.

User avatar
Richo
Senior Member
Posts: 3349
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

RC Mower

Post by Richo » Thu, 19 Jan 2017, 20:40

Still not it but you get the idea.
You can see the bolts sticking out the rim.
You can also see the hoverboard wheel in the hub hole.
Image
Help prevent road rage - get outta my way! Blasphemy is a swear word. Magnetic North is a south Pole.

Post Reply