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  1. #1
    bitza500 Guest

    Default HOW MANY GEARS? HOWMANY TEETH ? BUT i DO NOT HAVE THAT MANY !

    Hi guys this long winded rebuild is starting to get to me so PLEASE HELP.

    I have just assembled the gearbox and have gone to fit the side gears from the gearbox to the tumblers But I am missing a gear Al in Canada who has 2 Hercus's both have 40tooth and a 56 tooth on the gearbox shaft and a 80 tooth as the Idler

    Well I have a 56 and a 80 tooth but no 40 tooth
    I have gone through all my downloads to find out what or why I am a 40 tooth gear missing but the hercus Book of Turning does not even tell you what size gears are standard

    So can anybody enlighten me as to the reason I am missing a gear as I swore I had a twin gear on the gearbox ie 20 tooth& 56 tooth as a combination as I have a space were there should be something but the Book does not provide me with a very accurate picture or details as to the standard Factory Specs for a Model A lathe end gears

    Also I am chasing the concentric and lever off the apron as due to having some of the parts plated to stop rust The smaller cast items just snap and was warned that some parts chrystalised when plated and break easy well this just fell in half and not from knocking the pin for the lever in as I had the complete apron finished picked it up and a piece fell on the floor so now I have to disassmble and find another

    I have emailed Moyles but no response
    Are they closed ???

    all the best Derek

  2. #2
    Join Date
    Mar 2007
    Location
    Canberra
    Age
    67
    Posts
    179

    Default

    I think the 40 tooth gear your are referring to is for cutting 4tpi to 7 tpi threads. Mine is just bolted on the outside of the 56 tooth gear so it doesn't get lost. When you need to do 4 - 7 tpi you unbolt it off the shaft and replace the 20 tooth stud gear with the 40 tooth.
    Peter

  3. #3
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    Bit lost with what your asking in regards to your gear train,you are either missing the gear because you have lost it or it wasnt on the shaft to start with.
    Unless you want to turn the 4 to 7 TPI threads just make a spacer of some type to stop the 56th gear moving on the shaft,even some washers would be ok.
    I take it this is for a standard lathe and not the one you have riser blocks on.
    The gears can be sourced so there is no problem getting them except perhaps for price.

  4. #4
    bitza500 Guest

    Default Missin geers

    hi Pipeclay, I am not sure that the setup on my lathe is original as every time I look at something it is either been remade or replaced and even after working all night trying to find the missing Gear I am still no better off
    it looks like from what I can see is the 56 tooth is missing as I have a 40 on the gearbox as I know know that the gearbox had 2 gears 1 40 tooth and 1 56 tooth

    This is only part of my problem as to just get it standard, then I have to work out how to connect the gears to the Headstock which is 2" higher as I was going 40, 80, 80, but then the top runs backwards (ON PAPER )

    I have to run 3 gears of the same size??? to get it back running the right direction but will having 3 gears the same size give me the same gearbox settings ???

    So far I have when stripping this lathe come across 2" and 3" nails instead of tapered pins the idler tumbler pulley is not a 20 Tooth and the gear on there looks like one of the Model A Apron ???

    The spindle nuts were crushed in the vice to take up the wear????
    the spindle has no thread on the end it has been cut off drilled and tapped plus it is to short

    What I thought was a good old girl turns out to be a bad old girl and well mauled the rest seems ok it just looks like the previous owner did all his own repairs and patch ups

    So all I am trying to do is get all the original parts so it is standard, so I can work out the gear train to the raised up Headstock so I have a gearbox that has the correct setup


    I hope I can get some help with the gearing I will require to get this setup mobile as the rest is all done and assembled

    Bar the raised tailstock as I am still looking for a taller and larger tailstock

    So I have started with problems,then made more problems for myself in doing this conversion

    I hope this makes sense

    all the best Derek

  5. #5
    Join Date
    Sep 2008
    Location
    Prince George BC Canada
    Posts
    89

    Default Does it matter if gearing is backwards?

    Can't you just run the tumbler gear opposite to make it run the right way.

    I'm glad you stopped into see the guys at Newmac, he thought mine was a "H" so we got that straightened out.
    I ordered gear cutters today and I'm going to have a go at makin some gears for mine. I still did order the hercus gear 56 from them just to have it original equipment. First I'm going to make some out of Nylarod material to see how it will work, they say it has been engineered for a gear application so we'll see if it can handle the tooth loads.
    I made a bevel gear out of this stuff for a taiwanese lathe I got for cheap cuz if was missing a nylon/plastic feed gear behind the apron and it sees to work great. The great thing about this stuff is u can make your own gear cutters out of steel and it cuts great.
    I will edit some pics and post here in a bit just to show what can be done. I mean the thread is about gears right! lol
    Last edited by aljunk; 8th Jan 2009 at 12:11 PM. Reason: forgot to post pic
    Remember if the ID exceeds the OD the hole will be on the outside!

  6. #6
    Join Date
    Sep 2008
    Location
    Prince George BC Canada
    Posts
    89

    Default Bevel gear

    Here's a link to some pics of a gear I made last summer. I found an old washer that was 7mm thick and about 50mm round sorta did a freehand of the tooth profile in the lathe and used a Zip cut grinder to cut 4 'teeth' in it filed a bit of relief angle and voila!
    This gear was missing a few teeth and the feed would stop when it got to the stripped gears. It's what they call a sacrificial gear, it's supposed to strip if the feed gets jammed up but since the machine is 17 yrs old they no longer make parts for them, it's a Goodway made in Taiwan. I contacted the factory and they said parts were obsolete but actually emailed me the blueprints for the gear (and all the rest of the apron parts) I was amazed that they would do that! It works great too by the way, very smooth and quiet.
    http://photoshare.shaw.ca/messages/v...arm/page/1/15/
    Remember if the ID exceeds the OD the hole will be on the outside!

  7. #7
    Join Date
    Sep 2008
    Location
    Prince George BC Canada
    Posts
    89

    Default Metric or Imperial? I'm just curious...

    What is the norm down there metric or imperial? We're kinda both here, used to be only imperial but in 1970 or so they started the switch to metric here. All goods being imported for sale must have metric labeling now etc, and all goods sold must be in metric quantities.
    Remember if the ID exceeds the OD the hole will be on the outside!

  8. #8
    Join Date
    Feb 2006
    Location
    Lindfield N.S.W.
    Age
    62
    Posts
    2,383

    Default

    Quote Originally Posted by aljunk View Post
    What is the norm down there metric or imperial? We're kinda both here, used to be only imperial but in 1970 or so they started the switch to metric here. All goods being imported for sale must have metric labeling now etc, and all goods sold must be in metric quantities.
    I don't know what is standard, but the 127 tooth and 63 tooth gears are often used to get a metric approximation. The other good system is the Myford two 21 tooth gear conversions (works well for a 8 tpi leadscrew). If you want I can (when I get home from holidays) give you the Myford table
    Cheers

    Jeremy
    If it were done when 'tis done, then 'twere well it were done quickly

  9. #9
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    The majority ofNew mechanical items in Australia are Metric,still a lot of older Imperial things being used,and some new stuff from the States is a combination of both(more so when the manufactureing of items is spread globally).

  10. #10
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
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    64
    Posts
    4,887

    Default

    Dereck do you just want to get the gearbox to work so that you can use the feeds or do you want to screw cut as well.

  11. #11
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
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    Default

    Another thing to have a look at is where the banjo bracket hits on the gearbox,I dont think you will have clearance to be able to raise the bracket your 2" without it hitting the box.

  12. #12
    Join Date
    Jun 2006
    Location
    Macedon, Victoria.
    Age
    65
    Posts
    68

    Default

    Yeah Aljunk; most of us are bilingual down under, especially the older guys. Absolutely nothing unusual in a timberyard for someone to want an 8 x 2; 3.6metres long
    Chipslinger

  13. #13
    bitza500 Guest

    Default WHich Gear???????????????????

    Hi Guys, what I need is to make sure that on the Gearbox shaft there is 2 gears 1 is a 40 and the other is a 56 tooth and the idler gear is a 80 tooth
    Is this the standard for a Imperial setup???
    And I am hopefully get 2 matching gears to run of the idler onto the tumbler so I still have the same ratio ???

    As If I use 2 x 32 teeth gears from the 80 tooth will the ratio still be the same
    Will the ratios still be the same if the 2 extra matching gears 32 tooth are use so as to connect the gearbox to the tumbler assembly

    I am a bit lost in ratio but if you use 2 gears the same size the ratio should should not change ?????

    Can anybody who has some more Grey matter upstairs tell me if this will work ????

    all the best Derek

  14. #14
    bitza500 Guest

    Default Ratios

    Quote Originally Posted by pipeclay View Post
    Dereck do you just want to get the gearbox to work so that you can use the feeds or do you want to screw cut as well.
    Hi Pipeclay, I want to be able to use the gearbox eventually for screwcutting but working out the extra pulleys I need is my main problem
    My brain tells me that if I connect 2 matching size gears to get the exta height all I will have to di is use the tumblers back to front as Aljunk said that it should work but I am chasing opinions on the adding a Matching pair of gears onto the 80 tooth Idler so as to connect to the 20 tooth on the Tumbler assembly and still have the gearbox running at the same speed and the same ratios ???

    all the best Derek

  15. #15
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    On paper it appears to be ok with either 2x32 or 2x40 gears.
    Have you checked to see if the banjo bracket will clear the gearbox.

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