BAZMAK-A dedicated indexing head for the Sieg mill

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Foozer

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That puppy is coming to life . . . Just a half-cent item - Wouldn't a stud loc-tite'd into the clamp serve better - With the mud hands I have, the repetitive loosening and tightening of a bolt into Al returns the reward of galled and/or pulled threads.

Made some T-Nuts from 7075-T6 which is tough stuff in it's own right, but having that nagging feeling of pulling threads, stuck Heli-Coil thread inserts into them . . .
 
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Yes you are probably correct.Room for improvements all round
The stud is screwed in nom 30mm of thread so I am not too worried
I do need a little more ummff with a larger knob but the clamp is necessary
still have a couple of thou play in the detent housing which I will try remedy
Have a couple of tools,jigs and fixtures to make then I will try making a
couple of gears
 
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I made a 16mm dia mandrel fitted with a 4mm x 80mm lg key
Fitting a key, by that brought back memories.It was a perfect fit
on a lathe change gear,and like a fool I thought it would be the
same fit on all the gears WRONG.Those chinese.Had a pleasant hour
fitting all the gears to my master keyed shaft.Also made a couple
of clamping collars.Almost ready to go.I plan to make an alum blank
set up on the mandrel and finish turn in the lathe,the whole setup can then be
transferred to the index head in the mill.I plan to make a test gear in alum
using my homemade cutter. I have ordered 4 involute cutters 4,5,6, & 7
then I plan to rework the spare change gears from the old lathe to fit the SC4
 

bmac2

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Hi Bazmak
Your indexing head is looking great. I’ve been following along here hoping to pick up some tips on cutting gears. Summer is wrapping up here so I’ll be able to get into the shop again soon and finish getting tooled up.
I have basically the same mill and in your last pic that looks like a gas strut. If so could post a couple of pictures of it. I’ve been looking at a couple of mods to replace that damnable spring.

Bazmak indexing head.jpg
 
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Yes I did the mod.It was much easier than I thought.The struts come in pairs
300mm travl and about 150nm 15kg.Single tapped hole at the bottom and a bracket at the top.They come with the 2 ball joints.Taking okk the old spring assy made room for fitting a vernier scale to rthe z axis.I did a thread Bazmak-fitting a vernier to the Z axis.Will resurrect for your info
 
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I will resurrect this thread as I have started a mod to give me the option
of direct indexing and/or worm and wheel.The idea being that removing the index plt and detent housing only involves 2 screws and I can then fit
the W/W assy.Trying to have both assembled at the same time was too complicated.The worm is be M20 as I have a tap and can buy commercial allthread.The biggest wheel I can fit is nom 100mm dia which I can cut
with 120t,this will give me 3o per rev.Rather than plts I plan a dial divided
into say 30 to give me 0.1 degrees.Still mostly in my head.Picture tell the
story so far. TBC
 

Nick Hulme

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You have just got to make a nice bronze worm, that wheel looks far too nice to run with threaded bar!

- Nick
 

Hopper

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Awesome work, mate. Looks just like a bought 'un.
 
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Good idea with a bronze worm.Will get this going first then maybe
build op a brass worm on a steel shaft and single point screw cut
for the exercise.As usual its flying by the seat of pants,no drawing
just ideas that hopefully develope
 
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All finished and works well.Made and fitted a graduated dial that gets me down
to 1 minute of arc,say 0.02 of 1 degree
Made and fitted a brass swivel bush to enable the worm to be swung in to the wheel,hand tight reduces backlash to virtual zero
Machined up the allthread.Made and fitted a brkt with a 10mm shouldered skate bearing.Reworked an old handwheel from the scrap bin,and made and fitted a graduated dial devided into 60.Each full rev is 3o
3 main divisions are 1o and each divided into 20 or 0.05 degrees
Works well no backlash just need to iron out the stiffness
Remove 3 screws to take off the full assy and 2 screws to refit the dividing plate.Cant wait to try it out by cutting a gear with an oddball n o of teeth
 
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Had a PM from Steve saying he wished to make the indexer or RT or similar
Ressurected for accept to photos etc If you ask questions on this thread
you can keep it going and we can help you thru your build.Will also reopen
the RT thread and replace missing photos Regards Barry
 
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