How To Fix Coffee Whisker's Trembling? - Page 1
Forum section: electronics / general

author: Boris_yo
author_rank: Frequent Contributor
timestamp: August 04, 2012, 07:10:28 pm
content: Its end starts trembling and after some time stabilizes. It feels it's not loose but it trembles and if I correctly grab it fully with my hand, it settles:Seems like vibration issue. Maybe I could put some kind of smoth O-ring between whisker's base and that black plastic that does not produce friction/hinders it from rotating:Something that would set stainless whisk straight but would not hinder it from rotating?

author: G7PSK
author_rank: Super Contributor
timestamp: August 04, 2012, 09:10:11 pm
content: The shaft is bent or the end is out of balance. once it has run up to a certain speed it it runs within its own center of gravity in the same way that a turbine spool does.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: August 04, 2012, 09:57:46 pm
content: Quote from: G7PSK on August 04, 2012, 09:10:11 pmHow can I balance it?

author: Rerouter
author_rank: Super Contributor
timestamp: August 05, 2012, 03:05:03 am
content: or judging by its construction its exactly like cheap dremels where the motor is only secured by fit rather than any kind of rubber or adhesive, after resucuring it with some thin rubber sheeting my dremel is now rock solid,

author: SeanB
author_rank: Super Contributor
timestamp: August 05, 2012, 06:01:37 am
content: I replaced the little motor inside on one I had, the top "bush" of the motor had work loose. Took another similar motor and used it as a source of parts, as I needed a long shaft version that I could not find at the time in the scrap toy pile.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: August 05, 2012, 08:22:38 am
content: Quote from: Rerouter on August 05, 2012, 03:05:03 amSuggesting me to disassemble and have a look at motor to secure with something, provided it is badly fit?

author: SeanB
author_rank: Super Contributor
timestamp: August 05, 2012, 08:30:21 am
content: Motor will be a tight press fit in the housing ( you have to bash it to pieces to get it out normally) so this points to a worn front bush. Very common on these cheap motors. You probably can find a new less worn bush in a cheap OHL toy and do a transplant. There is really no way to put a second one in there with the motor one. Just remember to place a drop of food grade lubricant on the new bush before installing.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: August 05, 2012, 09:07:29 am
content: Quote from: SeanB on August 05, 2012, 08:30:21 amDo you think replacing existing motor with more powerful motor will speed-up and increase coffee's foam preparation?

author: SeanB
author_rank: Super Contributor
timestamp: August 05, 2012, 09:29:19 am
content: More powerful will not fit, better to use low impedance rechargeables to give more power to the motor rather than heat in the cells.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: August 05, 2012, 09:37:07 am
content: Quote from: SeanB on August 05, 2012, 09:29:19 amWhy rechargeables and not lithiums? I heardnon-rechargeablelithiums are the most powerful batteries today:

author: SeanB
author_rank: Super Contributor
timestamp: August 05, 2012, 09:45:29 am
content: With regular use the rechargeable will probably work out cheaper.

author: T4P
author_rank: Super Contributor
timestamp: August 05, 2012, 12:39:09 pm
content: non-rechargeable lithiums are expensive