- Thread starter Pete.
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Pete.
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Gimme half a chance there's a lot of it
Motor is sadly 415v only and 3/4" shaft so I will have to replace that. I'll run it temporarily on a VFD at reduced power. I don't have any 3/4" shaft motors spare.
Pete.
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It's back together. There's still a lot of cleaning to do, and oiling too as well as a bit of repair
Here's the clever end, 3 entirely separate sets of adjustable gear trains:
And more fancy gubbins inside:
The red bits are flakes of paint where we took it apart.
Here's the clever end, 3 entirely separate sets of adjustable gear trains:
And more fancy gubbins inside:
The red bits are flakes of paint where we took it apart.
God mode restorations
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That gear train is awesome
Pete.
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The three sets of gears:
This arrangement is how you set the gears according to how many teeth are on the gear you want to cut. It's the same regardless of whther it's a spur gear, a helical gear or a wormwheel.
This set of gears determines the feed rate for cutting spur gears. Since the teeth are square across the gear you only need to set the feed rate you require to get a nice finish on the tooth, and to give good tool life. The square drive end pokes out through the casing and allows for a handle for moving the feed slide manually:
These are the differential gears. They are arranged (using fancy calculations) to turn the gear blank at such a rate that it allows for the extra rotation required to time to hob and blank correctly when cutting helical gears. This is something I have to learn to do.
There's a warning in the manual that you must be sure to disengage the feed gears before engaging the differential gears, or serious damage will result. It's a bit like putting your car in 1st and second gear at the same time (if you could) - you're going to mash something up. I suspect that someone has done just this because one of the feed gears has damage in several places:
Thankfully, the damage seems restricted to a few teeth on one gear. I can re-make this one easily enough.
This arrangement is how you set the gears according to how many teeth are on the gear you want to cut. It's the same regardless of whther it's a spur gear, a helical gear or a wormwheel.
This set of gears determines the feed rate for cutting spur gears. Since the teeth are square across the gear you only need to set the feed rate you require to get a nice finish on the tooth, and to give good tool life. The square drive end pokes out through the casing and allows for a handle for moving the feed slide manually:
These are the differential gears. They are arranged (using fancy calculations) to turn the gear blank at such a rate that it allows for the extra rotation required to time to hob and blank correctly when cutting helical gears. This is something I have to learn to do.
There's a warning in the manual that you must be sure to disengage the feed gears before engaging the differential gears, or serious damage will result. It's a bit like putting your car in 1st and second gear at the same time (if you could) - you're going to mash something up. I suspect that someone has done just this because one of the feed gears has damage in several places:
Thankfully, the damage seems restricted to a few teeth on one gear. I can re-make this one easily enough.
Pete.
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Stack of change gears. There are four different sizes of gear. 2mod for the hob speed gears, 1.5mod for the input gears for the index banko, 1.25 mod for the index change gears and 1 mod for the feed and differential change gears.
Inside the electrical panel. Very basic, an on-off pushbutton switch for the pump, a fwd/rev switch for the motor and a pair of momentary buttons to operate the motor contactor.
This makes me very happy. The 1/2" arbor is removable and fits on a shallow taper with a 5/16"UNF drawbar. This means that I can make a new taper and allows me to use my extensive collection of 10mm hobs, plus any other size hob I might find.
BTW that arbor was very very stuck in there Took 4 tonnes on my press to release and buckled the drawbar so I have to make a new one.
Inside the electrical panel. Very basic, an on-off pushbutton switch for the pump, a fwd/rev switch for the motor and a pair of momentary buttons to operate the motor contactor.
This makes me very happy. The 1/2" arbor is removable and fits on a shallow taper with a 5/16"UNF drawbar. This means that I can make a new taper and allows me to use my extensive collection of 10mm hobs, plus any other size hob I might find.
BTW that arbor was very very stuck in there Took 4 tonnes on my press to release and buckled the drawbar so I have to make a new one.
Pete.
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Oh, BTW I did get the machine to a place where I could power it up with the motor, but I decided against it. Some of the slides and movements were very gummed up from lack of use and I was worried that the same might be true of the multitude of gearboxes and shaft bearings. I want to go right through the machine lubing up and de-gumming everything before running it under power so I don't end up tearing up a plain bearing.
Shiny Steve
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Good to see it back together Pete, the overall condition looks really nice.
Pete.
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Sure thing Stu I got a couple of them you can have.
Pete.
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Here's a handy feature that both my hobbers have. The two bolts in the middle are pinch bolts for the very finely bored housing. They allow you to move the spindle quill in and out (you can see it's quite a bit 'out' in the pic as the gears are mis-aligned) a certain amount to balance the wear on the hob. A tiny bit of pinch is required to hold the spindle in place, if you use too much it deforms the quill and binds the spindle. Just like my Mikron, the spindle is plain hardened steel running on a plain bore with generous grease grooves.
Spot the iffy-looking countersunk screw holding the far gear. Someone put the washer on backwards - the other side is countersunk, so I turned it around
Spot the iffy-looking countersunk screw holding the far gear. Someone put the washer on backwards - the other side is countersunk, so I turned it around
Martin Hocking
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Wow! Pete, that machine couldn’t have found a better home. Lovely to see.
I’m looking forward to plenty of “oh I never knew that…” moments in this thread. Already had a few!
I’m looking forward to plenty of “oh I never knew that…” moments in this thread. Already had a few!
Pete.
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I could think of one...
If it was only for cutting spur gears I would have passed it over, but I really wanted a machine that could cut helicals.
I thought that is a great bargain - then I saw they are £120 EACH
