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EddyCurrent
07-03-2014, 10:55 PM
I've had a search about but nothing much to find, here's the problem;

Hiwin HG15 bearings come with a poxy little domed grease nipple, they have a M4 x 0.7 thread, I have a grease gun and grease but what fitting do I need to get grease into them ?

Jonathan
07-03-2014, 11:50 PM
Not sure what fitting they're meant to take, but in the recent build I just made my own adapters to fit in the thread (M6x1 in my case) and routed tubes to each bearing (and ballnut) so oil can be injected into them. Arguably a bit OTT... it depends how far you want to take it and how easy access would be to the existing fittings.

11789

EddyCurrent
08-03-2014, 12:01 AM
I've decided to use grease but that's what I'm thinking, make some adapters. Quite a lot of the large motors I've worked on had extension tubes for the grease nipples because they would have been inaccessible otherwise. It's a daft design on their part I think, if only they were 6mm instead of 4mm. I'm thinking about a right angle adapter made of brass with a 4mm male thread and a 6mm female to take a standard nipple.

EddyCurrent
08-03-2014, 11:22 AM
But I didn't want to say that, I want to know what other people do with regard to greasing these and how ?

johnsattuk
08-03-2014, 03:13 PM
used 4mm nylon elbows which were a push fit into the carriage

EddyCurrent
08-03-2014, 09:03 PM
Looks tidy and good access to nipples, got a source for these elbows ? I can only seem to find pipe thread fittings.

johnsattuk
08-03-2014, 09:16 PM
Hose Fittings 4 - 4mm Barbed Hose Elbow Connector Blue Nylon | eBay (http://www.ebay.co.uk/itm/Hose-Fittings-4-4mm-Barbed-Hose-Elbow-Connector-Blue-Nylon-/231022857863?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item35ca090e87)
Tefen Elbow Hose Joiner (Nylon/Plastic) | eBay (http://www.ebay.co.uk/itm/Tefen-Elbow-Hose-Joiner-Nylon-Plastic-/141200239247?pt=UK_DIY_Materials_Plumbing_MJ&var=&hash=item20e030aa8f)
90° Right Angle Elbow Connector- Barbed Nylon PA66 Joiner for Tube Pipe or Hose | eBay (http://www.ebay.co.uk/itm/90-Right-Angle-Elbow-Connector-Barbed-Nylon-PA66-Joiner-for-Tube-Pipe-or-Hose-/280866638954?pt=UK_Home_Garden_Garden_Plants_Bird_ Bath_Feeder_CV&var=&hash=item4164f4cc6a)

EddyCurrent
08-03-2014, 09:19 PM
Ah I see it just pushes in at both ends. With it being captive in the aluminium plate it can't go anywhere so as long as there's a good seal at both ends it should be fine. thanks.

Ger21
09-03-2014, 02:07 AM
I spent an hour or two last week looking for some alternative fittings.
My Hiwin catalog lists a 90 oil fitting, but I have no idea where to get them from.

These might be able to be modified into something workable.
Dirtbike Fork Relief Valve Motorcross Fork Bleed Valve Air M4 0 7mm Stainless | eBay (http://www.ebay.com/itm/Dirtbike-Fork-Relief-Valve-motorcross-fork-bleed-valve-air-M4-0-7mm-stainless-/190988931791?pt=Motorcycles_Parts_Accessories&hash=item2c77d3d2cf&vxp=mtr)

My machine has two Z axis, so I have 8 blocks to grease.

I also found these.
https://www.hobbyking.com/hobbyking/store/__12257__M4_Brass_Pressure_fitting_2pcs.html
Synapse Synchronic Wastegate Barbed Brass Port Fittings - M4 x 4mm Hose (http://www.verociousmotorsports.com/Shop-by-Brand/Synapse-Synchronic-Wastegates/Synapse-Synchronic-Wastegate-Barbed-Brass-Port-Fittings-M4-x-4mm-Hose)

EddyCurrent
09-03-2014, 11:37 PM
Will this do the job ?

Grease Gun Push On Connector | Grease Gun Accessories | Oils & Lubrication | Online Bearings (http://www.onlinebearings.co.uk/Grease-Gun-Push-On-Connector.html)

or this one

http://www.ebay.co.uk/itm/GREASE-OIL-NIPPLE-CONNECTOR-CONICAL-PUSH-LUB-NOZZLE-4-JAW-HYDRAULIC-CONCAVE-OLD-/271410354568?pt=LH_DefaultDomain_3&var=570276892748&hash=item3f31515988

designed to fit these which are larger but similar to Hiwin nipples

http://www.stotfoldengineers.co.uk/stotfold_engineering_blog/2011/06/13/vintage-brass-grease-nipple-design/

JAZZCNC
10-03-2014, 12:04 AM
Looks tidy and good access to nipples, got a source for these elbows ? I can only seem to find pipe thread fittings.

Try these blokes they are excellent for things like this. I can't see any on sight but I bet they will have or will get you some.
http://airaccessories.fluidfittingsshop.com/

davethefixer
10-07-2014, 03:48 PM
Thanks for the info on the grease nipples guys.
Does anyone know what is the best type of grease to use in these linear rails ?

Lee Roberts
10-07-2014, 08:45 PM
Dave, some lithium 2 should get you off to a good start it's also what I use, cheap as well 400g tube - 3 should last you awhile.

.Me

EddyCurrent
11-07-2014, 03:18 PM
Thanks for the info on the grease nipples guys.
Does anyone know what is the best type of grease to use in these linear rails ?

This is the one I use, it's the right stuff at the right price.

http://www.toolstation.com/shop/Automotive/Mechanics%20Tools/Lithium%20Grease/d60/sd180/p89691

Also read this thread

http://www.mycncuk.com/threads/4862-Profiled-rails-Installation-guidelines-and-manufacturer-comparison-chart?p=33206#post33206

EddyCurrent
14-10-2014, 06:39 PM
First thing is, I would not recommend using the Hiwin size 15 linear bearing blocks because they are an abomination to grease. If though you do have them like I do, I found a good thread here about greasing them.

http://www.camheads.org/showthread.php?t=4431