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Thread: Buying a rack

  1. #1
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    Default Buying a rack

    I need a 20dp 33 tooth gear and a rack to suit. It's for a project I am about to start any idea where I can find one ?
    BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

    Andre

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    RC bought one from an eBay seller called cupcakeworld I think. He put a link in the latest project thread a few pages back.

    Ew
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    Truly not trying to be smart but... cut your own?

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    It have been considering cutting my own but I have no way of cutting matching gear . It for a stent tool and cutter grinder.
    BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

    Andre

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    You can cut the gear on the shaper too....

    Here is a link to a cup cake rack, Mod 2.0 though, could be a bit course. They sell gears too. 1M Length MOD 2 0 Steel Rack CNC Machine Router MILL Plasma Pinion DIY KIT | eBay

    Ew
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    Hi Guys.

    I'm of the same opinion ! Cut them yourself. If you don't try to cut your own you will never find out if you can do it or not. There are lots of tutorials on the web.
    Anyway if you are building the "Stent" some of the machining on that is more complicated than a simple rack & pinion.
    Best Regards:
    Baron J.

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    Alrighty I will buy a gear and have a crack at the rack.
    BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

    Andre

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    Quote Originally Posted by welder View Post
    Alrighty I will buy a gear and have a crack at the rack.
    I have to wonder if all those people offering you the advice to make your own rather than buying one have ever done it themselves. Nothing is difficult if you're not the one actually doing it.

    OTOH I have actually done it on a shaper. Needed 14DP rack for my Chipmaster. Couldn't buy it anywhere except 600 Machinery, the thieving bastards, so had little choice except make or change the DP to something else. I thought I'd have a crack at making it.

    My advice, FWIW, is to go and buy it. You can do it, most certainly, but frankly it is a PITA. Start by rigging up a single axis DRO spar so you can keep track of the tooth spacing and proceed from there.

    The gear is a piece of pee in comparison. All you need is a mill, the correct cutter and a dividing head.

    PDW

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    Another option would be 1.25 module and changing the design to suit the small change in centre distance....

    If my calculations are correct 1.25 module is 20.32dp
    Gold, the colour of choice for the discerning person.

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    Quote Originally Posted by .RC. View Post
    Another option would be 1.25 module and changing the design to suit the small change in centre distance....

    If my calculations are correct 1.25 module is 20.32dp
    Yeah that's what I'd do rather than make one. I have a length of 16DP 20PA rack and a pinion gear I bought to do that as a fallback position.

    Incidentally this talk of racks reminds me I have a spare rack for a Monarch 10EE lathe - also 14DP - that a friend of mine in the USA sent me some years ago to adapt to the Chipmaster if I thought it would work. I never used it and it's taking up space somewhere in a cupboard. It's yours if you want it. I've also got all the 14DP cutters you could borrow if you want to or need to make another pinion gear.

    PDW

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    PDW, no I haven't cut one myself and know nothing of the difficulties involved. However it seems like a good learning exercise, and I know he has a shaper, so I suggested it.

    Andre, if you do cut it yourself, could you be so kind as to post some pictures of your set-up and/or the finished work?

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    Quote Originally Posted by PDW View Post
    OTOH I have actually done it on a shaper.
    ..... frankly it is a PITA. Start by rigging up a single axis DRO spar so you can keep track of the tooth spacing
    Peter, was it only the indexing that was difficult, or the cutting too? Did you plunge with a straight tool first or start with the V tool? Either way the forces would be high.

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    Hi Guys,

    I'm one who made the suggestion to have a go at making one, and yes I have made a rack, yes it was a long time ago. If I remember correctly the hardest part was grinding a piece of 3/16" tool steel for the fly cutter. The chap (Stan) in the workshop next door at that time basically held my hand, giving instruction whilst using his grinder and his contour gauges. I remember it took several goes and ages to get it right.

    The rack was made from a length of brass bar clamped to the cross slide of my Myford S7 and the cutter fastened to a mandrel between centres. I have vague recollections of using the leadscrew handwheel to move the saddle for each tooth. It was slow work and whilst it took a long time, I learnt a great deal. I would do it again but I would try to make the gear as well today.
    Best Regards:
    Baron J.

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    Interesting concept Baron. I think the rest of us were thinking cut it on the shaper. Without power downfeed this would be a pain, plus the cut is a big one as Michael says. I guess going in at the PA would be the best bet with a nicely raked tool so it only cuts on one side.

    As for doing it on the lathe, theoretically you should be able to cut a rack half the length of your saddle travel. But you would need a bar rigid enough to hold the cutter and a way to support the blank solidly along its entire length.

    Ew
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

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