MGN12 from Alliexpress March 23, 2016 04:23AM |
Registered: 8 years ago Posts: 8 |
Re: MGN12 from Alliexpress March 23, 2016 05:35AM |
Registered: 8 years ago Posts: 67 |
Re: MGN12 from Alliexpress March 23, 2016 06:49AM |
Registered: 8 years ago Posts: 8 |
Re: MGN12 from Alliexpress March 24, 2016 02:15PM |
Registered: 8 years ago Posts: 1,671 |
Re: MGN12 from Alliexpress March 25, 2016 09:26AM |
Registered: 11 years ago Posts: 5,780 |
Re: MGN12 from Alliexpress March 28, 2016 07:25AM |
Registered: 8 years ago Posts: 16 |
Re: MGN12 from Alliexpress March 29, 2016 09:00AM |
Registered: 11 years ago Posts: 5,780 |
Anonymous User
Re: MGN12 from Alliexpress March 30, 2016 07:43AM |
Re: MGN12 from Alliexpress March 31, 2016 01:00AM |
Registered: 8 years ago Posts: 16 |
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If the things don't work right direct from the manufacturer, chalk it up to experience and buy a quality brand next time.
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You would be extremely lucky to improve them by working the same way
Anonymous User
Re: MGN12 from Alliexpress March 31, 2016 03:44AM |
Re: MGN12 from Alliexpress March 31, 2016 01:04PM |
Registered: 8 years ago Posts: 16 |
Re: MGN12 from Alliexpress March 31, 2016 08:37PM |
Registered: 11 years ago Posts: 5,780 |
Re: MGN12 from Alliexpress April 01, 2016 04:23PM |
Registered: 8 years ago Posts: 16 |
Quote
One of life's great, tragic truths is that quality costs. The sooner you face it, the less time you will waste trying to make poor quality things do things they aren't capable of doing.
Anonymous User
Re: MGN12 from Alliexpress April 02, 2016 05:38AM |
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bdurbrow
Everybody has to start somewhere. For this application, it doesn't have to be done "properly" - just "good enough".
Lapping a ball is a bit more challenging, because of the geometry involved - you need a spherical concave lap of the size to fit the ball. If you have a lathe with a suitable sphere turning attachment, you can, in principal, make one. Casting one against a good ball might also work; depending on what material you are casting with. Also, you will need a way to hold the ball being lapped.
However, if it's just one or two balls that are out-of-tolerance, I'd probably just replace them; even if you can only get a ball that is somewhat undersized the rail will still work OK. Personally, if it's a majority of balls that are bad; and I couldn't easily get balls of the required size, I'd either (if possible) enlarge block by lapping down the the runner to accept the next size up of balls, or scrap the whole thing as unworkable; depending on how much money I had in it, how much it would cost to get the balls (prices for that stuff varies depending on where you are - are you next door to a good bearing supply house... or in the middle of the African outback?); how much money you have available for your project, and how much effort you want to go to.
Anonymous User
Re: MGN12 from Alliexpress April 02, 2016 05:53AM |
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the_digital_dentist
If this was anything else and didn't work properly from the moment it was unwrapped, you'd send it back and complain. This is a part that is supposed to be precisely made and it isn't doing what it is supposed to. I wouldn't waste one minute more on it. Send it back and buy a better brand next time. I have found NSK guides to be very well made, and you can buy used ones for less than you paid for the piece of crap you got.
One of life's great, tragic truths is that quality costs. The sooner you face it, the less time you will waste trying to make poor quality things do things they aren't capable of doing.
Re: MGN12 from Alliexpress July 30, 2016 03:42PM |
Registered: 8 years ago Posts: 120 |