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[Brian60]

Anyone in the market for these? too early for me but someone might like them, 8rpm motors , very cheap as well.


http://www.ebay.co.uk/itm/6V-8RPM-2-Wire-Connecting-Cylinder-Shape-Reduction-DC-Gearbox-Motor-/191237638113?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item2c86a6c7e1

[Netleyned]

Thanks for the heads up Brian.
Just ordered a couple.

Ned

[Brian60]

No problem Ned. I had a look at his ebay 'shop' its obviously a trading arm of some large company in Hong Kong, they sell loads of stuff. I've ordered 30 microswitches, only a fiver! who cares it may take 10 days for delivery at that price, I wait that long for stuff to arrive in Spain from the UK! I've bookmarked the shop because there will be other stuff I want later in the new year, but for now I can pick up the switches from my UK home when we return end of next week.

[Netleyned]

Lots of interesting stuff on that site Brian.
No problem with the postage times when the
build is crawling along

Ned

[Tug Fanatic]

They also do a 12v 14rpm one which might be a better speed for smaller radar units. AND cheaper !!!! At 6v the speeds would be very similar.

http://www.ebay.co.uk/itm/DC-12V-14RPM-2-Wires-Electric-Geared-Box-Reduction-Motor-/190879714836?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item2c71514e14

[Ralfred]

Just ordered a couple of these, starting to build up a supply of various bits and bobs while im still working, will post when they arrive.

[inertia]

Isn't that a bit slow for a radar sweep arm? I thought they were more like 30RPM, but I stand to be corrected.
DM

[Netleyned]

Type 978 radar , standard navigational radarfitted to
Warships in the 60's  rotated at 20 rpm
The Bedstead AKE antenna rotated at 10rpm

There will probably be other uses for a slow rotating
unit.

Ned

[Brian60]

S band or X band type radar systems in maritime useage generally rotate between 2 and 6 rotations per minute. I would imagine the slower ones being weather radar. This is from wikipedia.

[Netleyned]

Raytheon X band Marine radars
come with three lengths of antenna
8 , 12 , and 18 ft
The rotation speeds are
In the range 18 , 22, 26 and 40 rpm
depending on antenna length and
usage.

Ned

[Netleyned]

Motors arrived today.
7days not bad for free postage
There is a UK address for returns
and aŁ3 off coupon for uxcell.com.
Tried one on six volts with a fishing
boat radar 1/16 and it looks spot on.
Well satisfied


Ned

[Brian60]

Motors arrived today.
7days not bad for free postage
There is a UK address for returns
and aŁ3 off coupon for uxcell.com.
Tried one on six volts with a fishing
boat radar 1/16 and it looks spot on.
Well satisfied


Ned

 

[Butts]

Postman has just dropped off a 12v 14rpm version. Seems to work well.

I'm planning to add a rope drum to it to make a winch to take up slack in my tugs tow rope.

Don't know how they can sell them at that price, it even came recorded delivery!

[Tug Fanatic]

.........................I'm planning to add a rope drum to it to make a winch to take up slack in my tugs tow rope...............

I think that you might be asking a lot! Don't forget that the tug will try to pull the rope off the winch - the load on the winch is the full pull load that you are putting into the tow including any snatch load. That is why towing winches are heavy duty bits of kit.

As you have one of these is it up to that job on your tug?

[Butts]

I take your point. 

I've seen similar jobs done with small motors, but I guess I'd need to look at one to see how they avoid the problem to which you refer.

If nothing else, it will make radar motor!

[Netleyned]

Looking at the ones I've got, I don't think the gearbox
would be up to the torque required for tug towing.
Good for radars but not much else.

Ned

[Butts]

On reflection Ned I think you are both right, I was possibly being a little over ambitious , radar motor it is.

[Skimmer Fan]

For you winch have you thought about a continuios servo.

[Tug Fanatic]

Converted electric screwdrivers - the small ones rather than a drill/driver - work well.

[Butts]

Yes, I think that is what our some of our Club Members tend to use now you remind me. 

[Islander51]

With a worm and gear setup there should be no problems with the line coming off the drum.


Edward

[Tug Fanatic]

With a worm and gear setup there should be no problems with the line coming off the drum.


Edward

That is true but by the time that you have purchased one of these plus acquired the worm gear set and made the gearbox housing it would have been easier & cheaper to go the screwdriver route and you would have a much more capable winch.

[Butts]

Thanks for the ideas Guys, I know where I'm going