Machifit MGN12H Fix! - Linear Rail
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- Опубликовано: 21 июн 2019
- This video shows you how to fix Machifit MGN12H Linear Rails from banggood.com that don’t work. Although some orders work, most are gunked up with bad lubrication and need to be properly cleaned. This video we help your slide move smoothly even without lubrication at all! Thanks for watching and please consider subscribing to support my future projects.
Link to Machifit MGN12H: www.banggood.com/MGN12H-25030...
Product full name: “Machifit MGN12H 250/300/500/550mm Linear Rail Guide Linear Sliding Guide Block CNC Tool - 500mm” 
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I ordered them today lets see how it goes
Thanks for This , I think I will do this when they will not be smooth
Do not use silicone grease to lubricate steel moving parts. Silicones do not work well in metal-to-metal contact. Do not use lithium grease on aluminum parts as they will damage the surface of the aluminum. The best solution for guide rails is either frequent lubrication with mineral or synthetic oil, or occasional lubrication with NGLI-2 grease. (I use blue "chevron delo" grease).
thanks, so simple and easy!
Thank you! This was the video I needed to see. I have a Mingda MD-6C with a bad X rail, now I know how I can order a replacement, and even how to fix them! :D Thank you!
P.S. I never had heard of Linear Rails until I got this 3D Printer that is driving me nuts.... Hope I can find the part at lenght though
This is made of fairly hard steel. I tried to scratch it with an HSS drill bit, the results were surprising considering the price.
I did all the cleaning but still can't slide by itself.
One other suggestion for people if just soaking the parts in alcohol doesn't work, would be to take the entire carriage apart and remove the ball bearings inside. Check the inside tracks, the ball returns on the ends, and any other surface for trapped grinding dust, burrs, swarf, or other debris that may have been trapped inside.
Another option would be to measure then purchase a set of replacement balls for the bearing itself. From what I remember, some incredibly high precision balls can be ordered very cheaply online because they're sold and used in such large volumes.
Hope this helps someone else too!
Thank You so much for the Info related to balls for the bearing separately ... Do you have by chance any link ? ... Thanks again
@@mariuspetcu7482 the ball bearings you want are 3/32" G25, I got mine on amazon.
But that way you take off the anti rust protection film :) Better way is just to drop a few drops of machine oil directly into the ball rows :)
For rails that aren't allowing the block to run smoothly, I like to clean everything thoroughly and then, depending on the application, apply any lubricants and anti-rust agents after the block runs smoothly. Thanks for your comment!
HI. How much play must have that linear block?
I don't remember what I paid for them at the time. This was over four years ago so the price is probably changed by now. The link to this product is in the description of my video if you want to check out current prices.
am using HIWIN blocks for our cnc router manufacturing... really expensive, can you suggest me best quality rails and blocks with lesser price than HIWIN ?
Did you found any big cons of those rails after year of usage? Any play or wear? Im thinking to buy it for small milling machine.
No, not really. Just keep them clean and if they're well supported they should be fine for most needs. They aren't the most precise rails out there. But for the price, you can't beat them.
Simply drop all package in spirit not an option?
Hi thanks for this quick guide, I'm considering ordering the same type of rails for my 3d printer. By the way do you know what is the size of screw needed to mount the rail for example in a 2020 aluminum profile?
jaguar1822 It is designed to use an m3 screw.
what printer are you looking to get this for, i will be getting a 300mm one for my ender 3 and hopefully once i get something that works i will be selling kits for it on ebay
@@Cosharek Hi, I want them to update my Anet A2
@@colekraus Thanks! :)
Cosharek I’m using them to build an automated sprout grower. If you’re interested you can check it out on instagram: instagram.com/sproutbot
Do you know if it is possible to "pop" the carriage off of the rail (ie twisting it off)?
I am looking at these for a project but I am wondering if a lateral force will push it off of the guide.
Daniel Tkaczyk in my experience is it not possible to twist it off with lateral force. I’m sure if your load doesn’t exceed a few points laterally it should be fine. These aren’t the most expensive linear slides on the market, so if there’s too much load I would use different slides.
@@colekraus Thank you for the quick reply! That's awesome to hear! In that case, I should be good to go. Thank you for the advice
I realize this was awhile ago, but wanted to post for anyone else that sees your question. The answer is almost certainly no, especially as you move up in size. Most sellers list in the pictures a table for the rail that will provide a list of how much static and dynamic force would be required to provide a permanent deformation to either the rail or carriage. From what I remember, these forces are listed for all the axis of force a carriage could experience, and most are in the hundreds to thousands of pounds/KG of force. True linear rails like he showed in the video are incredibly strong as long as they're installed properly.
Rails and blocks must be same company? Can we use defrent brand ?
The best chance of them working properly as if they're the same brand/company. That way you know that the blocks that come with it are designed to fit the rail.
I have ordered the same MGH12H with extra blocks, the problem is with the extra blocks, it does not move properly and it is hard. Maybe I should try your method to smooth the block movement. Thanks, @Cole Kraus
I would suggest trying my method. I’ve also found loosening the screws, adjusting and retightening once the block runs smoothly seems to be effective as well.
@@colekraus Hhhnnmmm I will try to reposition screw's you are talking about. Hope thats work. These blocks are giving me a pain in my @$$
@vial.of.photons yes, it is working smoothly, and one more thing needs to discuss with you. i have removed few steel bals (2 bal) from each block and it is working even more smoother. but I don`t have an idea what would happen?
@@colekraus tried all of this, but the extra blocks are all very tight, replaced all balls as well, but still no good. They do move differently under a load, but most of the extra blocks are useless. Removing several balls works, but I don’t think this is a solution. I’m still searching for a solution. But your smooth gliding blocks are very far from the ones I have.
Yeah, so the mgn carrige is not supposed to free moving freely when tilting the rail... The carriage is supposed to be "sticky"
Yes and no. I understand your point, but in my case, the carriage was so "sticky" that it would make a grinding noise and jitter when it moved. It now glinds smoothly, and I was able to add my own lubricant to it.
How flexible is the rail itself?
Travis Peña The rails are extremely rigid. They don’t bend. Some of them aren’t perfectly straight, but for simple applications they are fine.
@@colekraus Aw man so I cant get that
Travis Peña No problem, my pleasure
Sadece etil alkol mü olacak
im pretty sure they are supposed to be tight like that it makes it more accurate that is called preloading, so I don't think you really fixed anything
This product are good or not ...?
You recommend ..?
I recommend.
@@colekraus thank you sir