| Author |
Message |
Andrew Appleton
Unregistered guest
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| Posted on Friday, January 11, 2008 - 2:20 pm: |
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Hi,
Does the Geared Motor Kit Ref: 1450-120 come with a motor?
If not then, which motor(s) would be suitable? |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 670
Registered: 10-2004
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| Posted on Sunday, January 13, 2008 - 6:37 pm: |
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Andrew,
Yes it does, it comes with the same geared motor as per our part number 1450-002 which is a RE 140 motor.
Regards
Paul |
Steve Thackery (Thack)
Member
Username: Thack
Post Number: 1
Registered: 2-2008
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| Posted on Monday, February 11, 2008 - 4:29 pm: |
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Hi,
I'm just about to order a 940D motor but I notice it seems to come without any kind of mounting bracket. What would you recommend? Do you do a mounting kit for this motor?
Many thanks,
Steve |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 709
Registered: 10-2004
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| Posted on Tuesday, February 12, 2008 - 8:50 am: |
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Steve,
Unfortunately, none of the MFA planetry geared motors have a mounting bracket but there are tapped holes on the front face of the gearbox. This does mean you will need to come up with your own mounting arrangement. Most spur gear type geared motors do come with a mounting bracket. |
Steve Thackery (Thack)
Member
Username: Thack
Post Number: 2
Registered: 2-2008
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| Posted on Tuesday, February 12, 2008 - 9:52 am: |
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Many thanks for your reply.
Could you clarify the advantages between the planetary and spur gear motors? The two ranges seem to duplicate each other, with only the gearbox internals differing. What factors would make me choose one over the other? How do the noise levels compare?
Thanks again,
Steve |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 712
Registered: 10-2004
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| Posted on Tuesday, February 12, 2008 - 12:21 pm: |
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Hi Steve,
Our experience of the planetry geared motors is limited as we have always used the spur gear type in our own projects. We have just put a couple of types on the bench and noise level is slightly lower for the planetry type, they are more compact and offer a better protection against ingress to dust. Overall the construction looks to a higher standard and thus may offer a longer life but saying that, we have not had any problems with the spur gear type.
Regards
Paul |
Steve Thackery (Thack)
Member
Username: Thack
Post Number: 3
Registered: 2-2008
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| Posted on Tuesday, February 12, 2008 - 1:21 pm: |
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Hi Paul,
Great - many thanks for your help. Really appreciated it.
Regards,
Steve |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 714
Registered: 10-2004
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| Posted on Tuesday, February 12, 2008 - 3:16 pm: |
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You are very welcome. |
Steve Thackery (Thack)
Member
Username: Thack
Post Number: 4
Registered: 2-2008
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| Posted on Saturday, April 12, 2008 - 9:09 pm: |
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The 12V 940D I bought from you a few months ago has gone faulty. Specifically, it blew a fuse in the control circuit. In this application (driving a large display clock) it has a leisurely life, running off about 7V, and only for one second every minute. The loading is very small - a tiny fraction of the motor's rated torque.
When I first bought the motor (February 2008, I think) I measured its no-load current consumption at about a quarter of an amp at 7V, which is in line with the specifications given on your web page.
When I got the clock back yesterday (11th April 2008) I measured the current before removing the motor, and it had risen to 2 amps (this was with the load removed). Also the motor was running more slowly than usual. Furthermore, the current jumped about intermittently. Sometimes the current would fall to less than 1 amp and the motor would speed up. After a few seconds it would jump back up to 2A and the motor slowed down again.
Perhaps foolishly I increased the drive voltage to about 15V, to give the motor a good, high-speed spin. After a few seconds the current suddenly dropped right back, and in fact the motor has run fine since.
I suspected a problem with the bushes or commutator, so I prised open the tabs and removed the plastic end cap (with bush assembly).
I was disappointed to find large amounts of carbon dust around the inside of the plastic end cap, and the commutator was showing significant wear (deep grooving and a reduction in diameter where the brushes run).
I suspect (but can't prove) that the problem was caused by carbon particles or dust shorting out the commutator segments.
Bearing in mind how little use the motor has seen (a few hours run time at most since I bought it), I am reluctant to replace it with another of the same type. It has already been a major embarrassment to get the clock back from the customer after only a couple of months use (it involved a five hour round trip for two people). I fear I may well get the clock back again, and this would be a terrible reflection on my business.
Two questions: has anyone else reported similar problems? Secondly, can you recommend an alternative geared motor from your range which might prove suitable? I need a speed of around 80rpm at around 9V or so.
Thanks,
Steve |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 759
Registered: 10-2004
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| Posted on Sunday, April 13, 2008 - 9:21 pm: |
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Steve,
I'm sorry to hear you have had a problem with one of our MFA motors, we have sold thousands of these and rarely get any returns. I have to say I'm not surprised the motor has failed from what is I feel a very arduous duty. Every time a motor starts you will get an initial starting current that only lasts a short time whilst the motor gets up to speed. That is not normally a problem but in your application, you are starting the motor 44,640 times a month. So whilst this only amounts to about 12 hours a month, this is largely made up of starting current conditions, thus the wear on the brushes.
We do not have a suitable motor at present within our range, I would suggest a brushless type motor might be worth considering. |
Steve Thackery (Thack)
Member
Username: Thack
Post Number: 5
Registered: 2-2008
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| Posted on Sunday, April 13, 2008 - 11:08 pm: |
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OK, thanks for the comments. I think you are right - the conditions are unusual. Incidentally, I notice that the brushes are made such that all the contact pressure is concentrated onto two points, which is bound to lead to rapid wear initially until the brushes have worn somewhat. I think this is a shortcoming in the design of this motor.
Anyway, I'm happy to take your advice and consider a different approach. As you say, a brushless motor, or perhaps a stepper motor, may well be the way to go.
Thanks for your help and advice.
Steve |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 761
Registered: 10-2004
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| Posted on Monday, April 14, 2008 - 2:29 pm: |
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Hi Steve,
A stepper motor would be a very good solution. I will pass your comments back the manufacturer regarding the brushes the next time I speak to them. There may be a good reason for the way the brushes are made, maybe it aids the brushes bedding in.
Kind regards
Paul |
Ian S. Chambers
Unregistered guest
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| Posted on Tuesday, June 17, 2008 - 12:17 pm: |
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My question regards the planetary reduction gearbox part no: 1450-080.It uses a 540 motor. I have a Tamiya semi truck which I want to put an addition reduction into by using the above. Could you tell me if your gearbox could be used with the stock 540 motor that comes with the Tamiya kit as I have to use this with the multi function unit. Also if it is compatable, can you supply the gearbox without the motor?
Best regards Ian |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 810
Registered: 10-2004
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| Posted on Tuesday, June 17, 2008 - 7:50 pm: |
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Ian,
We do not know the spec for your Tamiya motor, motor shaft lengths and diameters can vary. The gearbox is not available on its own. Clearly you are going to have to get the drive gear off the MFA motor and fit it to your Tamiya motor. Also, the fixings holes on the MFA may differ as well. Can't you just use the MFA geared motor in place of the Tamiya?
Regards
Paul |
hmn44
Unregistered guest
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| Posted on Tuesday, July 1, 2008 - 9:01 am: |
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Hi
in order to obtain a speed of 33 RPM at 12V I'm interested by the RE 975D 75W Planetary Gbox 212:1 which is not a standard on your site but is presented on the MFA brochure. MFA requet a minimum order of 100 pieces! Are you able to sell it by 2 pieces only ? |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 827
Registered: 10-2004
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| Posted on Wednesday, July 2, 2008 - 10:44 pm: |
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Hi,
We only stock their three standard sizes, so sorry we are unable to help. |
len walker
Unregistered guest
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| Posted on Wednesday, August 13, 2008 - 11:42 am: |
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Hi
I’m interested in your RE 385 Planetary Gearbox 100:1 - Part No: 1450-061
To build the prototype I used a DeWalt 12v drill/driver with a max torque of 20Mn and a 1.3Ah battery, this does the job ok and uses very little power it has the torque to lift the weight I need, though there is very little extra capacity if I need to add more weight in the future, also because the load comes on and off (a bit like a cement mixer) I am concerned about the longevity of the final motor and gearbox used.
I’m looking at the RE 385 partly because of its final speed of 103 rpm at 12v, as this just happens to be the speed I need.
So can you answer the following questions with the limited information I have given?
The torque of the RE 385 in Nm?
The power consumption in Ah?
The likely longevity? I won’t hold you to this!
It’s suitability for lifting a load (up to 2.5Kg) if not can you recommend a motor and gearbox that is.
Finally I need this information in a form an idiot can understand!
Thanking you in advance Len |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 852
Registered: 10-2004
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| Posted on Monday, August 18, 2008 - 1:40 pm: |
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Len,
From our website we quote a torque of 6530 g/cm, a quick search on google for a conversion tool gives a figure of 0.64Nm. Power consumption depends on load but again from the website, we quote a figure of 0.837A at the rated output.
Life expectancy does depend on so many factors but we get very few returns on these motors so as long as they are used within their rated, you can expect a good service life. I will add that we did have one customer starting / stopping his motor every second 24 hours / day so it quickly wore out.
The load it can lift is a function of both the mass and the distance the load is from motor (i.e. torque) but using the 6530 g/cm torque figure, you can work it out from that i.e. 6.5 kg / cm or 65 g/m. |
Francis Thompson (Francis40s)
Member
Username: Francis40s
Post Number: 1
Registered: 1-2009
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| Posted on Wednesday, January 21, 2009 - 6:53 pm: |
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Hey, I notice that on your page for the 919D motor/gearbox combo it is said that the 11:1 is used in a 12kg robot. I'm building a 18-25kg UGV, for off road use, and am using 4 motors (1 per wheel). An output of about 200-300rpm is needed. Would any of these motors be suitable, or should I be looking at the 975D series and a chain drive reduction?
Cheers,
Francis |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 959
Registered: 10-2004
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| Posted on Friday, January 23, 2009 - 12:39 pm: |
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Francis,
We have seen 2-8 of these motors used in 12kg machines, I would say that 4 is optimum.
The 11:1 gives a final rpm of 1436 rpm. As you did not state the robot speed of wheel diameter I cannot advise if a 50:1 would be suitable but that gives about the right rpm. |
madscientist.me
Unregistered guest
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| Posted on Tuesday, January 27, 2009 - 1:26 am: |
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Do any of the 419D spur geared motors have an extended rear shaft for encoder mounting (like the 24V 942D planetary geared motors)
Thanks |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 969
Registered: 10-2004
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| Posted on Monday, February 2, 2009 - 3:26 pm: |
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Hi,
We do not stock any geared motors where the shaft extends out the rear as the motor shafts spins at a higher rpm than the gearbox output shaft. Sorry if I have misunderstood your question. |
Ken Barrie
Unregistered guest
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| Posted on Friday, May 15, 2009 - 11:40 pm: |
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I'm looking for a motor for a garage roller door. Your 919D Spur Geared Motors: RE 540/1 Metal Gearbox 810:1 - Part No: 1450-055 looks useable but what dia is the shaft. I presume it is reversable? |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1057
Registered: 10-2004
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| Posted on Monday, May 18, 2009 - 4:21 pm: |
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Ken,
At the top of the page where the 1450-055 is described is an engineering drawing with the dimensions shown. The shaft has a diameter of 5.98mm, it is reversible but I cannot image for a moment that it would be suitable for a garage roller door. Without knowing what the maximum torque needed to retract the roller, I could not recommend an alternative. |
Smudge (Smudge)
Member
Username: Smudge
Post Number: 1
Registered: 5-2009
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| Posted on Friday, May 22, 2009 - 2:41 pm: |
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Hi, I am very interested in your RE 280 Gearbox Kit - Part No: 1450-010. I have a few questions I would be very greatful for some input on.
- Can you tell me if it is assembled?
- If not, does it comes with ratio setup instructions?
- Are the gears fitted to a keyway to avoid slip?
- What is the difference between this gearbox and RE 140 Gearbox Kit - Part No: 1450-001? |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 1058
Registered: 10-2004
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| Posted on Friday, May 22, 2009 - 9:31 pm: |
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Hi,
- Can you tell me if it is assembled? No, as per the description it is a kit to make up a geared motor. Part number 1450-011 is the assembled version.
- If not, does it comes with ratio setup instructions? Yes it does.
- Are the gears fitted to a keyway to avoid slip? No, interference fit which is adequate for the motor power.
- What is the difference between this gearbox and RE 140 Gearbox Kit - Part No: 1450-001? If you look at our model motors section, the motors are available on their own and include performance tables, basically the 280 has about 30% more power over the 140. |
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