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Thread: Drill Holder For Lathe
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4th August 2015, 06:13 PM #16GOLD MEMBER
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To the guys that have the books. Are there any reasons given for this set up?
Looking at it, it scares me a little. I know some lathe owners live in fear of spinning a drill in the tailstock taper, so maybe that's it?(though I'm not sure I'd use my live center if I was running that drill through in one go)
If you were step drilling I guess it would make changing drill faster.
Why not use a boring bar?(assuming your not making 20off)
Stuart
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4th August 2015, 06:31 PM #17GOLD MEMBER
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From my lack of experience I would think that the type of setup with the parallel section with internal M/T would be suited to a lathe that may have either no M/T in there tailstock or if a M/T drill 2 sizes above the tailstock taper was to be used.
I have used a lathe dog attached to a M/T drill to give better drive when drilling large holes when a smaller than desired pilot is used.( So the drill does not spin in the tail stock taper.)
Cant comment on why a boring bar would not be used except for the common reasons.
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4th August 2015, 06:36 PM #18SENIOR MEMBER
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Flex
On jobs with a deep hole of say around 13-16mm diameter I've found boring bars flex too much. When using a drill, providing you use a centre drill and drill slowly to the shoulder, there is minimal flex.
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4th August 2015, 09:30 PM #19Senior Member
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4th August 2015, 09:47 PM #20Novice
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When we see some setups the first thoughts are that it could be a bit dangerous. The method shown above is a recognised method of holding/driving a drill in a lathe and is still shown in most text books. Here is a page from an old text book explaning how it does work with safety even on through holes. Hope it helps. All these old NSWGR Apprentice text books come in handy at times!! Worth looking for them at flea markets.
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4th August 2015, 10:17 PM #21GOLD MEMBER
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But we would seem to be dealing with drills much larger than 16mm and at least the one in the picture is not what I would call a deep hole
You do notice there is an important part in the sketch that is missing in the above picture?
Stuart
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4th August 2015, 10:37 PM #22Novice
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5th August 2015, 10:24 AM #23
He is probably talking about the forcing bar ... however you could use the saddle (crossslide and toolholder/post) to provide a rearward force.
Cheers.
Vernon.
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5th August 2015, 11:30 AM #24
I'm guessing the lantern tool post is supposed to be acting as the forcing bar??
Whether this setup is adequately safe or not it still looks like it has a margin for error greater than having a drill in the chuck or using a boring bar. So I can only assume it is a speed thing??…..Live a Quiet Life & Work with your Hands
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5th August 2015, 01:18 PM #25GOLD MEMBER
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He is.
Maybe you could, you could do a lot of things.. but that's not what the picture is showing.
Then it could be argued its in the wrong place. If it is being used as a force bar, why the bar/rest parallel to the bed?
So far thats my best guess. Though I have to assume you're making a lot of them and you dont have a (large)drill press.(which is fine, we don't all that camel backs... I'm just trying to find out why someone would use such a setup...... hey I might even be talked into using it myself)
Thinking about it a little more step drilling with this setup could be out(I would think) as starting the drill could be some what tricky in a large hole. Could be wrong though.
Stuart
p.s just because its in a book doesn't make it a great idea. One of my books says to get the hardest possible result quench tools in Mercury.
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5th August 2015, 04:01 PM #26
Yes, that's what I was getting at also.
No, the actual lantern post provides the rearward pressure, not the bar in the lantern post ... you would do so by manually holding the saddle handwheel so that the lantern post is being pushed towards the tailstock. Pressure would have to be adjusted as the tailstock is extended.
It would provide the same function as the forcing bar, however if it was me I would have the lantern post closer to the drill holder.Cheers.
Vernon.
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5th August 2015, 05:24 PM #27GOLD MEMBER
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It would seem we agree IF the lantern post is being used in place of the forcing bar then it is indeed in the wrong place.
The reason I say IF is because my guess as to why the long flat bar is being held in the lantern holder is that the carriage isn't being moved.
If you move the lantern in you're then supporting the bar in the wrong place.................at least so says the sketch.
Stuart
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5th August 2015, 06:09 PM #28
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