UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Other Vintage Household Electrical or Electromechanical Items

Notices

Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

Reply
 
Thread Tools
Old 4th Nov 2017, 6:13 pm   #1
robinshack
Hexode
 
Join Date: Jun 2010
Location: Spalding, Peterborough, Cambridgeshire, UK.
Posts: 396
Default Kenwood Chef food mixer safety observation

As title. Our mixer is a little over 40 years old. I think it is either an A701, or A701A. It is white and dark blue. Used possibly once a month these days. About 10 years ago, the capacitor burnt out, so I replaced just that part, all was fine. Switching on last week, the whole thing made a lot of noise and the speed knob was seen to be moving around violently. Machine was switched off immediately.
It was soon apparent the motor had come adrift from it's rubber mountings. Available on ebay, over 8 for the four. I was convinced I had something similar....somewhere. I even placed a "wanted" post!
Today, I found what it was I was thinking of. A set of strong, new, rubber mountings as used for domestic refrigeration sealed unit compressors. All I needed to do was reduce one side thickness slightly by cutting some rubber away with small sidecutters. Other than this, the dimensions were just right. I fitted them and ran the motor up and all was fine. Sorted!
However, the result of this new thread concerns electrical safety. The machine frame is all metal, but mains flex is 2 core, without earth. The electrical insulation safety integrity is provided by the rubber bushes insulating the motor electrically from the whole frame. My original bushes had perished and disintegrated, allowing the motor frame to move around within the non-existant insulation bush and most likely touch the metal fixing screw that was connected to external metalwork. Not a nice thought.
What I have done is to provide an earth wire from a 4BA solder tag, attached under a motor stator screw. This will connect with tyhe earth wire of a new 3 core mains lead that I will fit. Unfortunately the mains terminal board on the mixer is only 2 screws, L & N. So, I will connect the new 2 earth wires together using a butt crimp terminal.
This will give me peace of mind, that the metal frame of the motor is earthed at all times.
No doubt, such a modification to enhance safety is a wrong act on my part, as it is a modification from original manufacture. However, at least I will feel safer!
Rob
__________________
I think a little difficulty in life inspires the special day in our brain.(Yuuji Shimomura)
robinshack is offline   Reply With Quote
Old 4th Nov 2017, 7:12 pm   #2
rambo1152
Hexode
 
Join Date: May 2010
Location: Manchester, UK.
Posts: 375
Default Re: Kenwood Chef food mixer safety observation

In technical terms what you have done is convert from the original "Class 0" to "Class 1"

By coincidence, I contributed to a discussion yesterday in a different place about the same thing with antique photographic equipment, and the consensus was it's a very Good Idea (tm).

When there is a conflict between electrical safety, particularly in the kitchen, and "originality" I know which one I regard as more important.
__________________
--
Graham.
G3ZVT
rambo1152 is offline   Reply With Quote
Old 5th Nov 2017, 9:16 pm   #3
robinshack
Hexode
 
Join Date: Jun 2010
Location: Spalding, Peterborough, Cambridgeshire, UK.
Posts: 396
Default Re: Kenwood Chef food mixer safety observation

OK Graham, I agree entirely.
Test run this morning, all fine. I got the hot, slight burning smell as sometimes witnessed by other repairers, especially after changing the wirewound resistor.
I didn't investigate further as I assumed it was grease and some dirt coating said resistor. After a few minutes running, the smell disappeared.
During my earthing process, I also linked an earth wire from the aforementioned motor stator chassis to the main frame as well. Under the screws of the hinge bracket. Just in case.....
Rob
__________________
I think a little difficulty in life inspires the special day in our brain.(Yuuji Shimomura)
robinshack is offline   Reply With Quote
Old 5th Nov 2017, 11:43 pm   #4
Refugee
Nonode
 
Refugee's Avatar
 
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 2,718
Default Re: Kenwood Chef food mixer safety observation

I will have to keep an eye on ours.
The old one has been fitted with an earthed power cable for screening due to it having a rev counter fitted.
Refugee is online now   Reply With Quote
Old 6th Dec 2017, 12:46 pm   #5
Fidelity Fan
Hexode
 
Join Date: Jan 2013
Location: Wigan, Lancashire, UK.
Posts: 304
Default Re: Kenwood Chef food mixer safety observation

James May put one of these back together in an episode of The Reassembler made a year ago. It was very informative, but unfortunately I cannot find a link to the complete episode.
Fidelity Fan is offline   Reply With Quote
Old 12th Dec 2017, 6:52 pm   #6
McMurdo
Nonode
 
McMurdo's Avatar
 
Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 2,904
Default Re: Kenwood Chef food mixer safety observation

I'm sure my mother's had a double insulated sign on it, certainly they were BEAB approved
__________________
Kevin
McMurdo is offline   Reply With Quote
Reply

Thread Tools



All times are GMT. The time now is 11:41 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright ©2002 - 2018, Paul Stenning.