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  1. #1
    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 ?
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  2. #2
    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.

    Click image for larger version. 

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    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  3. #3
    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.
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  4. #4
    But I didn't want to say that, I want to know what other people do with regard to greasing these and how ?
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  5. #5
    used 4mm nylon elbows which were a push fit into the carriage
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  7. #6
    Looks tidy and good access to nipples, got a source for these elbows ? I can only seem to find pipe thread fittings.
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  8. #7

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  10. #8
    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.
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  11. #9
    Ger21's Avatar
    Lives in Detroit, United States. Last Activity: 12 Hours Ago Has been a member for 5-6 years. Has a total post count of 508. Received thanks 68 times, giving thanks to others 0 times. Referred 1 members to the community.
    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

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

    I also found these.
    https://www.hobbyking.com/hobbyking/...ting_2pcs.html
    Synapse Synchronic Wastegate Barbed Brass Port Fittings - M4 x 4mm Hose
    Gerry
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  13. #10
    Last edited by EddyCurrent; 09-03-2014 at 11:53 PM.
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