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Thread: Gear Head Drill

  1. #1
    Join Date
    Jun 2005
    Location
    Helensburgh
    Posts
    618

    Default Gear Head Drill

    My Arboga (branded and sold as a Servian in Oz) 4 speed gear head drill is getting a VFD fitted to it to allow a better range of speed control. The question is how fast can a gear head drill be driven, this drill also had an 8 speed version but I can't find any information on that but I bet it turned faster that the 1250 RPM that mine does. Has anyone got any idea of what a gear head drill maximum RPM would be?

    While I am here maybe someone can answer another question. This drill has three oilers on top of it for lubrication, is that all it needs or do these drills require more that that. I have had it for many years and always wondered if the gears should have grease on them but then I think that any grease would just get flung off the gears.
    CHRIS

  2. #2
    Join Date
    Dec 2011
    Location
    Deception Bay Qld
    Posts
    111

    Default

    My Rong Fu Ghd max is 1500 but it scares the crap out of me doing that speed, i think the gears are square cut and they get a real cackle up so i use the small drill press if i need those revs which is hardly never.
    It's 6 speed on VFD plus 3 speed down feed.
    Cheers

  3. #3
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    Hi Chris, my Arboga has a top speed of 1280 rpm going by the plate, no load it measures 1350 rpm.
    My Arboga, and l thought all others, were made with a 2 speed motor and that gives them 8 speeds. So is it possible that you have a 2 speed motor and you might be able to fit a 2 speed switch to gain an extra 4 ratio's.
    As for getting a higher speed out of it, same as Whitey l have another drill for that and honesty l would only use those high speeds when drilling out a jet with a number drill, and hasn't happened for some time now.
    As for lubrication,bl was told by another member just a couple of drops of gear oil every now and then, l have had.no need have a look inside mine but l believe that too much oil and it can get into the motor and kill it.
    Others may be able to elaborate on this.
    Cheers, shed

  4. #4
    Join Date
    Dec 2011
    Location
    Sydney
    Posts
    505

    Default

    From the manufacturer's Operating Instruction booklet for Arboga U-2580/EM825 (capitalisation as per original):

    " ... the machine needs very little lubrication. THE GEAR HOUSING MUST NOT BE FILLED WITH OIL. EXCESSIVE LUBRICATION SHOULD BE AVOIDED, AS EXCESS OIL CAN DRIP DOWN INTO THE MOTOR AND DAMAGE ITS INSULATION. A few drops of ordinary machine oil should be dripped into the oil cups and lubrication holes in the machine once or twice a week."

    Cheers,
    Bill

  5. #5
    Join Date
    Jun 2005
    Location
    Helensburgh
    Posts
    618

    Default

    Thanks guys, all good information. My drill has a two speed motor and two gear change speeds, the 8 speed I am familiar with had more gear change levers. The VFD was fitted today and it seems to work well and I won't run it any faster than standard specifications. The aim was always to fill in the gaps between gears as the VFD was so cheap I thought it was a good use for it.
    CHRIS

  6. #6
    Join Date
    Feb 2018
    Location
    Brisbane, QLD
    Posts
    4

    Default

    Hello.
    Since there is experience with Arboga drills here, I am wondering if someone can help me out with how to open the gear case to re-lubricate the drive-train?
    It a G 2508, I have the parts manual. Upon removing the four horizontal cap screws securing the RHS case half to the LHS case half, and the vertical cap screw securing the RHS case half to the main body, the RHS case half is free and can be partially opened, but there is something stopping it being completely moved away from the gear set.
    After several attempts I put it back together and it runs as before.
    Can somebody tell me the correct procedure to removing the case half please?
    Regards

  7. #7
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    72
    Posts
    3,102

    Default

    There are TWO screws holding each gearbox half to the main body. They are not in the same symmetrical location on each side....

    Also, I have a 1.5Hp DC motor with all the modifications to fit into an Arboga drill if someone wants to go down that track. Contact me by PM for details.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  8. #8
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    574

    Default

    I have my Arboga mil/drill VFD setup for a top speed of 4000, and have used it once at that speed when running an engraver bit, it did not seem to bother it, job took about 40 mins none of the castings or bearing housings went above just warm, it does have new bearings through-out. Factory top speed is 2800.

  9. #9
    Join Date
    Feb 2018
    Location
    Brisbane, QLD
    Posts
    4

    Default

    Joe,
    Thanks. I'm perplexed - can you please instruct me where the second screw is? Attached photograph shows the 4 horizontal and 1 vertical that are bleeding-obvious. It is these screws that I've had out but though the RHS gearbox half is free it can only be partially withdrawn from the machine.
    sketch1518133129683.png
    Regards
    Nigel

  10. #10
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    72
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    3,102

    Default

    That looks VERY different to mine. It is clearly much newer. Mine has 4 screws going in from underneath the ledge the gear cases sit on.
    IMG_20161002_132424.jpg
    You can see the holes here.
    Son't let yours get a filthy inside as this one.... this was How I got it, Stripped gear and all...
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  11. #11
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    Quote Originally Posted by cross_link View Post
    Hello.
    Since there is experience with Arboga drills here, I am wondering if someone can help me out with how to open the gear case to re-lubricate the drive-train?
    What are you going to lube the gears with ?
    I thought that the fibre and steel gears did not need lubrication and the few drops of oil that is added to the cups on the
    earlier models is for the brgs?
    Looking at the picture of yours l would have assumed that it has sealed brgs.
    Maybe l am totally wrong here tho, so maybe someone else can shed some light on the subject?

    cheers, shed

  12. #12
    Join Date
    Feb 2018
    Location
    Brisbane, QLD
    Posts
    4

    Default

    I finally got the case apart after removing the wiring gland to the switchbox, and the locating screw from the LHS half case so it too could be moved away from the centreline.
    All the shaft bearings are sealed and are in good condition. The double-row ball bearings in the clutched gears are semi-open cages. The whole arrangement was lubricated with sparing quantities of what appeared to be standard light-brown coloured grease, presumed to be lithium-soap type.
    The drill had spent the later part of it's life in an electrical workshop, drilling Permalli type material, and dust had found its way throughout the motor and gear head but that does not appear to have done any noticable damage; the gears are all in good condition.
    After some research I was going to re-lubricate with the light PTFE fortified grease I use in my bicycle bearings, but due to needing to also lubricate the double row bearings I am going to use a standard lithium grease; the drill has done well on it.

    My only concern is that the bearings in the Tufnol gears were presumably once interference fit in the bores, but now they are a just a little loose. The gears are helical, so the gears will try and rotate towards the shaft.
    Does anybody have experience with this issue, and has gone as far as replacing or rebuilding the assembly?

  13. #13
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
    Posts
    1,522

    Default

    How loose are we talking? Loctite can hold over a pretty sizable gap, at least 0.008" which is a really loose fit. I can't remember which grade deals best with an air gap though.

  14. #14
    Join Date
    Aug 2009
    Location
    Perth Australia
    Posts
    13

    Default Arboga GM2508

    I have recently acquired one of these machines which has auto down feed
    I've perused all the threads on the Forum but need some advice.
    I am trying to dismantle the head and am unable to withdraw the right hand side which contains the auto feed selection and gearing. Can anyone offer some insight.
    The cover and gears have been moved (separated by about 12mm bu tit won't withdraw any further.
    All comments appreciated.
    jimrunciman

  15. #15
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    574

    Default

    Do you have a manual, if not then one is available for download from here Arboga drill parts lists

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