KH7050 Linear Rail Replacement

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Daniel Max
Posts: 4
Joined: Tue Jul 16, 2019
Location: Dublin
Country: Ireland
Laser Machine Make or Type: KH-7050 (red and black)
Laser Power: 60W
Laser Bed Size: 500mm x 700mm
Home Position: TR
RDWorks Version: v8
Windows Version: 8.1
Accessories: mA Display

Hi folks,

Wondering does anyone know what linear rails are used in the big red (and black) KH7050.
One of the Y rails is ever so slightly bent/ curved/ bulged in one section, which affects about 100mm x 200mm of cutting area. The laser beam is completely misaligned in this area of the machine due to this 'bow' in the rail, so it barely cuts even with power inreses :(

So I want to replace the rail but there are so many variations and model numbers for rails online, I'm so lost.

The rail I currently have is approx. W12mm H8mm with holes every 25mm and the Length is approx. 660mm

Any help would be appreciated!

Thanks,

Daniel
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Pete Cyr
Posts: 1964
Joined: Sun Nov 27, 2016
Location: Suffolk Virginia
Country: United States
Laser Machine Make or Type: Boss 1630
Laser Power: 100w
Laser Bed Size: 16"x30"
Home Position: TR
Control Software: RDWORKS
RDWorks Version: v8.01.18
Ruida Controller: RDC6442
Windows Version: Win 10
Accessories: roller rotary attachment

The rail and the associated bearing come as a set - if you look at the bearing it should have a manufactures name (in most cases).
Location - VA
Equipment - Boss Laser 1630
Power - 100W
Laser Bed Size - 16" x 30"
Home Position - TR
Full RDWorks Version - v8.01.18
First name - Pete
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Jeffrey Aley
Posts: 388
Joined: Fri Aug 11, 2017
Location: Folsom, California
Country: United States
Laser Machine Make or Type: Kehui
Laser Power: 50W
Laser Bed Size: 500mmx300mm
Home Position: TL
RDWorks Version: 8.01.24
Ruida Controller: RDC6442
Windows Version: Win10 Enterprise
Accessories: Spray bottle with water (for small fires)
Fire extinguisher (for big fires)

Daniel Max wrote: Fri Feb 14, 2020 Hi folks,

Wondering does anyone know what linear rails are used in the big red (and black) KH7050.
One of the Y rails is ever so slightly bent/ curved/ bulged in one section, which affects about 100mm x 200mm of cutting area. The laser beam is completely misaligned in this area of the machine due to this 'bow' in the rail, so it barely cuts even with power inreses :(

So I want to replace the rail but there are so many variations and model numbers for rails online, I'm so lost.

The rail I currently have is approx. W12mm H8mm with holes every 25mm and the Length is approx. 660mm
Different laser manufacturers use different rails. Mine are HiWin (brand) rails & bearings, or a clone thereof.
IMG_3060_edited.jpg
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Doug Fisher
Posts: 206
Joined: Sat Aug 20, 2016
Location: Atlanta, Georgia
Country: USA
Laser Machine Make or Type: Ke Hui KH-7050
Laser Power: 80W EFR F2
Laser Bed Size: 700x500
Home Position: TR
Control Software: LIGHTBURN
RDWorks Version: v8.01.18 & 8.01.33
Ruida Controller: RDC6442
Windows Version: 10
Accessories: Ruida RDC6442G EC controller, 2" lens, S&A CW5000 chiller, chuck type of rotary attachment, Russ' DoHickey (sp?), mA meter, a growing collection of tools and oddities to keep it running!

Many red and blacks come with cheap clones of HiWin rails. In those cases, you probably won't find any markings on the rails or bearing carts. HiWin rails are the industry standard but they are expensive. Hopefully someone here will know a reasonably priced alternate that still is high quality (make sure the carts have an actual lubrication coupling as a standard feature!).

Please update this thread and let us know how your replacement project goes so we all can learn.
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Daniel Max
Posts: 4
Joined: Tue Jul 16, 2019
Location: Dublin
Country: Ireland
Laser Machine Make or Type: KH-7050 (red and black)
Laser Power: 60W
Laser Bed Size: 500mm x 700mm
Home Position: TR
RDWorks Version: v8
Windows Version: 8.1
Accessories: mA Display

Thanks for all of that info folks.

Unfortunately, no markings anywhere on anything, the joys.

Thanks above for going to that trouble to show your set up. Mine is a different rail profile.

From some obscure site I managed to find some sort of a prat number and then found a spec sheet too.

So it seems it's a copy of a hiwin rail that has a number : MGN12.

Since none of the companies I've contacted have replied, I think I might just have to take a chance and hope I manage to get it right 1st time.

Thanks again all!
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Tim Mellor
Posts: 560
Joined: Wed May 29, 2019
Location: Shipwreck Coast, Victoria
Country: Australia
Nickname: beanflying
Laser Machine Make or Type: Vollerun WR3020
Laser Power: 40W
Laser Bed Size: 300x200
Home Position: TR
RDWorks Version: n/a
Windows Version: 10
Accessories: Modded and still Modding some more.

Depending on who you were trying to contact due to the current Virus a lot of people are on extended breaks until about a week ago in China so I would think there is a significant backlog of emails to attend to.

Not sure about your specific case but the general experience with 3D printers fitted with Chinese origin rails has been poor overall. You will also find faked Hiwin for sale if the source is mainland China rather than Taiwan. Try looking for a local distributor might also be worth a try https://www.hiwin.com/distributors.html
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