Axles and Couplings

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Caradocrouse (Caradocrouse)
Member
Username: Caradocrouse

Post Number: 1
Registered: 6-2006
Posted on Friday, June 16, 2006 - 9:59 pm:    Edit Post    Move Post (Moderator/Admin Only)

I bought a 3mm - 4mm coupling from you recently, and the fit doesn't seem very good - the 4mm side is a good snug fit but the 3mm side is very loose on the axle I have. I have measured the 3mm side and it seems somewhere nearer 3.5mm (but the 4mm axle I have won't fit in to it so it's not a 4mm - 4mm coupling). Is this always the case or do I have a faulty product?
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 211
Registered: 10-2004
Posted on Monday, June 19, 2006 - 6:34 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi,

It certainly would not be unreasonable to expect these couplings to be machined to an accurate size and this is the first time this has been raised. Return the coupling to us and we will investigate and replace as necessary. Please accept our apologies for this.

Unable to Email you direct as you did not leave an Email address.
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 221
Registered: 10-2004
Posted on Saturday, June 24, 2006 - 8:54 am:    Edit Post    Move Post (Moderator/Admin Only)

Hi,

We have received back the coupling and it is actually a 4-4mm. We have checked our stocks to find they are all 4-4mm. Clearly they have been packaged incorrectly by the manufacturer. We will get new stocks in and send you a replacement asap.

Apologies for this and thank you for bringing it to our attention.
chris
Unregistered guest
Posted on Wednesday, July 26, 2006 - 11:24 am:    Edit Post    Move Post (Moderator/Admin Only)

hey all, i need to build a kit for a camera dolly, 4 pneumatic wheels affixed to 2 axles, then those attached to a wooden platform, real simple, i can choose tyre etc but then dont know the best way to attach it all, if anyone can make a list of stuff i would be grateful, thank you.
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 246
Registered: 10-2004
Posted on Wednesday, July 26, 2006 - 9:28 pm:    Edit Post    Move Post (Moderator/Admin Only)

Chris,

I assume that the wheels are not motorised and that the wheels have internal bearings. If this is the case then all you need is axles fixed to your wooden platform using anything suitable such as 'U' bolts.

If you need the axle to be able to rotate then pillow block bearings are ideal. We stock both pressed steel and cast steel.

Not sure if that answers your question.
Dave Todd
Unregistered guest
Posted on Sunday, November 5, 2006 - 9:26 am:    Edit Post    Move Post (Moderator/Admin Only)

Can you provide an axle some 2'6" long threaded at each end to take a bicycle wheel. This is for a music trolley which has got too heavy for wood on its own to support

Thanks
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 314
Registered: 10-2004
Posted on Sunday, November 5, 2006 - 8:56 pm:    Edit Post    Move Post (Moderator/Admin Only)

Dave,

No promises but we may be able to help. In our move to new premises recently we manage to find room for a small workshop with a couple of lathes and a milling machine. What diameter axle do you need and what threads on the end? Also what material do you need, can it be mild steel? A sketch would help.

Regards
Liz Hawkes
Unregistered guest
Posted on Wednesday, September 24, 2008 - 9:37 pm:    Edit Post    Move Post (Moderator/Admin Only)

I have got a motor with a 8mm shaft and I am trying to get a inline coupler fot this would you know of anything that I can use that would be suitable.
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 882
Registered: 10-2004
Posted on Thursday, September 25, 2008 - 6:11 pm:    Edit Post    Move Post (Moderator/Admin Only)

The largest couplings we have are 6mm although we have been asked for 8mm before. It is possible that the 6mm coupling could be drilled out to 8mm bore. Take a look at 4604-004, whilst I do not have the overall diameter to hand, the large photo looks like it will take being bored out to 8mm.
Rangaswamy
Unregistered guest
Posted on Friday, October 31, 2008 - 9:08 am:    Edit Post    Move Post (Moderator/Admin Only)

Can you please send me a dimensional drawing of an Inline Coupling 3mm to 3mm - Part No: 4604-001? I need this to use in my design of a fixture.
How to get the dimensional details for other items in your website?
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 911
Registered: 10-2004
Posted on Sunday, November 2, 2008 - 7:58 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hi,

Sorry but no drawings available for this range of products. If you need the physical dimensions let us know and we will measure a coupling for you.
Peter Litten
Unregistered guest
Posted on Tuesday, March 10, 2009 - 2:00 pm:    Edit Post    Move Post (Moderator/Admin Only)

I want to use one of your stepper motors to drive the model I am making and need to attach a gear adaptor to the 5mm shaft. As there isn't a 5mm adaptor should I order a 4mm one and drill it out?
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 999
Registered: 10-2004
Posted on Wednesday, March 11, 2009 - 9:01 pm:    Edit Post    Move Post (Moderator/Admin Only)

Peter,

I'm a little uneasy with drill out the 4mm model to 5mm bore as the threaded section is only M6 making the wall thickness rather too thin. As an alternative, you could drill out the 4mm Pololu hubs 4609-104 to 5mm. Also, is there any way you can utilise the 5mm coupling 4604-006?
lance deller
Unregistered guest
Posted on Friday, May 8, 2009 - 11:00 pm:    Edit Post    Move Post (Moderator/Admin Only)

would it be possible to drill out the 4mm side to 6mm on this coupling
Inline Coupling 3mm to 4mm - Part No: 4604-009
thanks
lance
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 1054
Registered: 10-2004
Posted on Monday, May 18, 2009 - 3:47 pm:    Edit Post    Move Post (Moderator/Admin Only)

Lance, The OD is 8mm leaving a wall thickness of 1mm which is insufficient, so no, not really.
Thomas Willers
Unregistered guest
Posted on Sunday, June 6, 2010 - 7:40 pm:    Edit Post    Move Post (Moderator/Admin Only)

Dear Technobots,
A quick question about your "zinc collars"
Are these zinc plated steel, and so could be welded, after the removal of the coating, or not.
I need a way to attach a drive wheel to a live axle, and so think i can weld the collar to a steel plate, to bolt onto a steel rim wheel. Many thanks.
Thomas Willers
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 1256
Registered: 10-2004
Posted on Monday, June 7, 2010 - 8:15 am:    Edit Post    Move Post (Moderator/Admin Only)

Yes, the collars are BZP steel. You would need to remove the plating before welding due to the zinc fumes that are hazardous.