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8 Attachment(s)
Lathe Indexing Fixture
Hi guys,
This is just addition to lathe chuck brake, but both combined make perfect tool.
https://www.youtube.com/watch?v=V_INGZB9iZs
Consists of the following parts:
- Lathe Chuck Brake (already described)
- Indexing disc
- Bar
- Indexing pin
- Locking piece
Indexing Disc
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It is actually brake / indexing disc as it has 2 purposes.
Making of that disc is described in my post 'Lathe Chuck Brake' and drilling
of the holes on it was done as follows:
1. Brake / Indexing disc was mounted onto lathe chuck with three 8mm bolts.
2. 5" four jaws scroll chuck was mounted onto 6" rotary table. TIR 1/100 mm.
3. Both chucks were connected with perfectly straight 22 mm s.steel round bar.
TIR at lathe chuck = 2/100 mm, which is almost negligible for this project.
4. First I drilled inner circle of holes (24 holes) with 15/64" drill and afterwards milled
holes with 1/4" end mill. Then outer circle of holes (30 holes) was done the same way.
With these 2 rows of holes I have the following divisions: 2, 3, 4, 5, 6, 8, 10, 12, 15, 24 and 30.
Bar
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Made from 30 x 5mm stainless steel flat bar; two bars connected at 90 deg angle.
Guider for indexing pin made from 15 mm s.s. round bar, drilled with 1/4",
one end threaded with M12 thread and screwed onto flat bar.
Indexing pin
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Made from S.S. 8mm round bar. Partly turned to 6.35 mm
Locking Piece
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Made from steel 10mm bolt. Head of the bolt was milled in order to fit behind the brake block.
And the most important for the end:
Chuck brake keeps chuck fully locked in desired position.
Regards
LMMasterMariner
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I liked the brake but now this has really got my interest,
"With these 2 rows of holes I have the following divisions: 2, 3, 4, 5, 6, 8, 10, 12, 15, 24 and 30."
Boy do I have a lot of catching up on my math, luckily I have a rotary indexer but I still can picture needing more division as I imagine I will eventually want to
make some gears.
Thanks for posting, more distractions to be thinking about.
Ralph
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That spindle brake is fast becoming as handy as pockets on a shirt
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I have some brake disk from a Nissan and a 12x36 Craftsman lathe I wonder if maybe I could...
Damm, the poor lathe has been sitting outside my shop for the past six months and is likely to set there for another year if I do not stop letting myself
get distracted with these projects that keep popping up.
But at least this one I would have to get the area in the shop finished so I could bring the lathe in to do the work on it.
I really like the indexer function, I am just starting working with a lathe so I do not know about the brake but I can see where that might be a benefit.
Ralph
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Ralph if you noticed in the video the brake also served to further secure spindle by removing any possibility of movement in the indexing arm
I can foresee gear cutting on this lathe with the addition of a mill and since the brake is controllable in the amount of applied braking force, with the proper fixtures even helical gears
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Ralph,
I have 6" rotary table on my milling machine for cutting gears. Also have 2 sets of involute gear cutters modules M1 and M1.5. Half of the sets actually, from #5 to #8, so I can cut from 26 teeth to rack. Also purchased R8 arbor for these cutters. Indexing fixture on my lathe will be used mainly for rifling grooves inside barrels once I complete my lathe/rifling machine project, which is postponed for some better times.
Regards
LMMasterMariner