Archive through December 23, 2008

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patrick sanchez
Unregistered guest
Posted on Tuesday, May 6, 2008 - 4:42 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi!

What motor and gear set can we use to lower a motor's speed to 1 rpm, and at the same time move a load of 300 lbs. The motor will be used to drive a turntable for product display. Please advise me on what models you have in stock that we can use.

Can you also provide a motor to wheel adaptor hub (something like this: http://www.npcrobotics.com/products/viewcat.asp?cat=18&mode=gfx ), how much will this cost additional ?

Thanks!
Patrick Sanchez
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 783
Registered: 10-2004
Posted on Tuesday, May 6, 2008 - 8:39 pm:    Edit Post    Move Post (Moderator/Admin Only)

Patrick,

Whilst you have quoted the load on the turntable, what is needed is the torque needed to rotate the table. One method you may like to consider is friction drive from a rubber bush on the motor or geared motor direct to the turntable outer edge. What diameter is the turntable.

Sorry but no wheel hubs like that from the link you gave.
dave lee
Unregistered guest
Posted on Wednesday, May 7, 2008 - 10:29 am:    Edit Post    Move Post (Moderator/Admin Only)

I need 2 geared motors to run at 60 rpm they are turnong a pair of steel shafts about 40 mm diameter 100 long with very little load can you advise me what is best and include evrything I need motors gearboxes controllers etc it would be useful to have the speed variable if possible.
Dave Lee
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 785
Registered: 10-2004
Posted on Monday, May 12, 2008 - 8:05 pm:    Edit Post    Move Post (Moderator/Admin Only)

Dave,

We have a range of geared motors that will turn at or about 60 rpm, see our MFA geared Motors. We cannot be more specific as you have not specified the torque you need, operating voltage or any other particular requirements such as size. Take a look though as there is almost certainly something there that will suit.

As for controlling the speed, once the geared motor is chosen, we can then look at a suitable controller, but we will also need to know how you are going to control the speed i.e. radio control, computer control, potentiometer?

We await your additional information.
henry jones
Unregistered guest
Posted on Tuesday, May 13, 2008 - 8:08 pm:    Edit Post    Move Post (Moderator/Admin Only)

I want to remote control a loft hatch weighing about 5 Kg and moving through a 5ft arc
can you advise a motor capable of this and can you supply one with a spool which will hold enough cord to do the job?
many thanks in anticipation of your reply
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 789
Registered: 10-2004
Posted on Thursday, May 15, 2008 - 7:05 am:    Edit Post    Move Post (Moderator/Admin Only)

Henry,

You may well find that a linear actuator would be better although if it was to fail, you may have difficulty in manually over-riding it. As for a spool, there is nothing standard we can offer but it would not be difficult to make something up using our pulley and shaft products.

To size the motor, we would need to know how fast the spool is going to rotate (which in turn means how fast the hatch opens) and whilst the weight of the hatch maybe 5kg, what is the load on the motor (taking into account the hatch being hinged and the angle at which the cord is attached to the hatch). The easiest way to approach this is to attach the cord to the hatch, then using a spring balance or some weights, estimate the load needed to open the hatch. We can always over-size the motor to makes sure there is some tolerance.
Cowana (Cowana)
Member
Username: Cowana

Post Number: 4
Registered: 5-2008
Posted on Tuesday, May 13, 2008 - 9:22 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi.

I want to design a robot to carry electronic equipment. I want it to go over 16mph, and it will be roughly 40cm square. I like the look of your 100 solid tyres and wheels. I was looking at one of your 12V 150W motors with a speed of 2800rpm, though I found this would need 5cm wheels to reach 16mph - larger and too much current would be drawn if the robot was 4.5kg.

I would like the robot to be about 10kg if possible - driven by two motors, what power would be neeeded at each motor to get it going 16mph?

I don't really want to do gearing, but if it needs to be done, I asume that a chain is easiest?

I also want to try and stick to one battery (12V), but I could use two if it is needed for the motors.

Cost is the main oponent here - if it can be avoided, I don't want to spend more than £50 (including wheels) on each side of the robot for power.

It doesn't need much torque - it won't be pushing anything.

Andrew

ps - faster is better.

Any questions?
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 792
Registered: 10-2004
Posted on Saturday, May 17, 2008 - 12:49 pm:    Edit Post    Move Post (Moderator/Admin Only)

Andrew,

A 2800 rpm motor woth 100mm wheels would need a 2:1 reduction.

You already have a thread going on this topic but to summarise, motor power depends on torque required as well as speed. The torque will then give you acceleration as well as the ability to handle varying loads such as the terrain.

As a general rule, you cannot direct drive from a motor without gearing. You will either need to use a geared motor or build your own gearbox and chain is considered by most to be the easiest method. How the robot turns, whether it is 4-wheel drive or not also influence motor sizing.

Your budget may be too low to achieve the spec you have.

Regards
Sergio Fiorenza
Unregistered guest
Posted on Saturday, May 17, 2008 - 11:54 am:    Edit Post    Move Post (Moderator/Admin Only)

RE: 540/1 Metal Gearbox 3000:1 Part No: 1450-056

i would like to use this for roasting a pig weighting in at 80kg. Would this do the job?
Thanks for your information,

Sergio
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 793
Registered: 10-2004
Posted on Saturday, May 17, 2008 - 1:07 pm:    Edit Post    Move Post (Moderator/Admin Only)

Sergio,

This question has been asked before, if you search for 'hog' that should bring up a link to the page and then look for admin post 656.
martin Rogers
Unregistered guest
Posted on Sunday, June 8, 2008 - 9:14 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi

I need to power a trolley on a floor. The weight is 200kg and I need a speed of variable speed of 1-4 MPH. The rear wheels are 200mm diameter. (I will use these to drive trolley

Please can you advise

What geared motor will do this
What speed control do I need.

Many thanks
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 806
Registered: 10-2004
Posted on Monday, June 9, 2008 - 9:53 pm:    Edit Post    Move Post (Moderator/Admin Only)

Martin,

Using our speed calculator with a typical motor rpm of 3200, 4 mph and 200mm diameter wheels gives a reduction of 18.74:1. As for motor power, considering the relatively high gearing, I would suggest one of our 36V 750W geared motors. As this motor gives a higher speed than you need, you will need a further reduction to get down to the speed you need.

Using our speed calculator again, but this time entering the motor performance of say part number 1471-115 of 420 rpm, 200mm wheels and 4mph gives a further geared reduction of 2.46:1. You can achieve this using 3/8" chain drive from the motor to your drive axle. If you need advice with this part, let us know.

As for a speed controller, how do you want to control the controller i.e. potentiometer or radio control? Do you need reverse?
nick townsend
Unregistered guest
Posted on Monday, July 28, 2008 - 4:49 pm:    Edit Post    Move Post (Moderator/Admin Only)

Dear Technobots,

I am looking for a (DC) motor, that can be operated CCW and CW, operating at 0-240rpm and provide a torque of up to 20Nm. I was looking at the 24V 400W MY1018E - Part No: 1470-036 motor on your website and was wondering whether this is capable of providing these requirements. And would I be right in assuming a speed reducer of 10:1 would be about right to do this? Also if so, is there a geared unit which fits with this motor or would it have to be a 'DIY' job to create a speed reducer?

Many Thanks

Nick
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 835
Registered: 10-2004
Posted on Monday, July 28, 2008 - 9:43 pm:    Edit Post    Move Post (Moderator/Admin Only)

Nick,

A 10:1 reduction will give about the right RPM with an approximate torque of 17Nm. Variable speed can be achieved by the use of a large variable power supply or motor speed controller.

You will need to make your own multi-stage gearbox using gears or chain / sprockets.

You could consider one of our ready made geared motors with maybe a single stage of further speed reduction.

Regards

Paul
Charlie Whittuck
Unregistered guest
Posted on Friday, August 29, 2008 - 9:49 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hello, I'm looking for a small, slow, low torque motor and a small speed controller. (ideally 4rpm +/- 2rpm) Preferably not bigger than 50mm diameter. the shaft would be of a diameter ideal for your 6m sprokets. To turn one low weight object.

Also i need pillow blocks and bearings, ideally with a 8-10mm interior diameter (could be 12mm) with minimum resistance.

if at all possible also a linear coupling that could step down an 8,10 or 12mm drive shaft to 4mm?
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 864
Registered: 10-2004
Posted on Tuesday, September 2, 2008 - 8:53 pm:    Edit Post    Move Post (Moderator/Admin Only)

Charlie,

Please advise what voltage you wish to run the motor at and what size 6mm sprocket you need on the motor. Can you also estimate the torque needed or what describe the "low weight object". This will enable us to recommend the best motor for you.

Pillow blocks are not available below 12mm bore and our model bearing blocks only go up to 6mm. So sorry cannot help with that one.

Our reducing couplings do not go above 6mm although some of them could be drilled out larger.
Alan (Albut)
Member
Username: Albut

Post Number: 1
Registered: 10-2008
Posted on Sunday, October 5, 2008 - 6:54 pm:    Edit Post    Move Post (Moderator/Admin Only)

Similar question as above but for which there was no real answer. I am building whats known as a Barn Door Tracker. It is an attachment that fits to a camera tripod and tracks the movement of the stars for photograpic purposes. Including the camera the whole weight of the item should be no more than 3kgs.

It needs to rotate fairly constant at 1 rpm, be compact and operate from a DC 6/9 or 12 volt supply. Also What can you suggest.

Please dont ask me the torque required because I wouldn't have a clue.

Regards
AB
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 894
Registered: 10-2004
Posted on Tuesday, October 7, 2008 - 7:00 pm:    Edit Post    Move Post (Moderator/Admin Only)

Alan,

Recognising that 3kg is not that large a weight but without knowing the torque required we cannot give you a firm answer. You could try a 1450-056 which would give 2 rpm at 6v. You could gear down 2:1 using say our timing pulleys but we do have a number of ways to achieve it depending on the mechanics of your 'barn door tracker. It is possible that 1450-106 may also work although price is similar but is lower power and smaller in size.

Hope that helps.
kevin jones (Kevinjones9)
Member
Username: Kevinjones9

Post Number: 1
Registered: 11-2008
Posted on Thursday, November 13, 2008 - 9:47 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi, what a great site!

Hopefully you can help. I am looking for a 12v DC brushless motor that can move 12kg of camera!
I want to make a pan & tilt system for my video camera.
I have made one with the following motor specs but it can only move 6kg of camera!

Do you have any motors with roughly the same spec as below but obviously with more torque in order to move 12kg?

DC Brush GearMotor

Gear Ratio (Rxx number) 1000
Rated Voltage (VDC) 12V
No Load Speed Before Gearbox (RPM) 5000
No-Load Current (A) 0.1
Rated Speed Before Gearbox (RPM) 4300
Output Power (watts) 1.8
Rated Current (A) 0.33
Stall Current (A) 1.5
Length "L" (mm) 29
No Load Speed After gearbox (RPM) 5.0
Rated Speed After Gearbox (RPM) 4.8
Rated Torque After Gearbox (Kg-cm) 6.0
Peak Torque After gearbox (Kg-cm) 18
Rotation Direction CCW


Any advice would be greatly appreciated.

Thanks.
KJ
Mark B (Macaba)
Member
Username: Macaba

Post Number: 1
Registered: 12-2008
Posted on Sunday, December 21, 2008 - 1:20 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi Technobots!

I am considering using the 36V 750W Geared 6:1 600rpm MY1020ZX3 motor. I would like to keep the gear reduction but offset the axis of rotation. So I'm looking for a 1:1 chain gearing ratio and some bearings and bearing blocks that will support a 0.5" shaft with at least 100kg of load.

Could you advice on which products I could use, and to clarify, I'm looking for:

2 sprockets, with the same number of teeth, and one that can be mounted on the motor output shaft.
Bearings that can support a 0.5" shaft with 100kg of load.

Thanks!
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 944
Registered: 10-2004
Posted on Tuesday, December 23, 2008 - 7:17 am:    Edit Post    Move Post (Moderator/Admin Only)

Mark,

We only supply metric size bearings and I would suggest something larger than 12mm, say 15mm or even 17mm depending on how you support the final drive. We have a number of pillow type bearings that should suit as well as silver steel sgafts to match.

We would always suggest 3/8" pitch chain on motors of this size, as you only need 1:1, the number of teeth will be determined by the shaft sizes. This means you may need to bore them out to suit your application or accept a slight different reduction ratio if the sprocket sizes differ.