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Thread: What's in a vertical head?
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14th April 2011, 10:51 PM #1Product designer retired
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What's in a vertical head?
Greg, making a vertical head would be a terrific project.
For the uninitiated like me, what's inside?
I'm guessing, but firstly you are going to need a housing. I assume a horizontal input shaft will enter the housing via bearings, and will terminate with a bevel gear.
Another bevel gear will transfer the torque to a vertical shaft having at it's end, some form of taper to accept an arbor. Is the transfer ratio 1:1?
This impression is greatly simplified, am I close?
Ken
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14th April 2011 10:51 PM # ADSGoogle Adsense Advertisement
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15th April 2011, 09:00 AM #2SENIOR MEMBER
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That's how the Hercus vertical head works Ken, extremely basic. However the gear ratio is 1:1.5 as I recall, anyway there's a speed increase over the horizontal. The increased speed would be beneficial for the typically smaller cutters used in the vertical head as opposed to the horizontal.
Pete
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15th April 2011, 09:13 AM #3.
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I could have posted some cross sectional drawings of various heads, but the question was asked of Greg. They are all pretty simple. The differences will be in the accuracy of their execution.
BT
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15th April 2011, 09:29 AM #4.
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I had better clarify "simple". I'm only talking about a basic, bolt on head as fitted to say the Hercus or my Schaublin. Things increase in complexity when a drilling quill is introduced and become vastly more complicated when we get into the realm of Bridgeport type heads.
BT
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15th April 2011, 10:06 AM #5.
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Aciera F1 Head
This may be of interest to Greg and other viewers. Malcolm Wild is an English clockmaker and maker of tools for clock and watchmaking, who addressed the need for a vertical head with a precision drilling quill to fit the little Aciera mill favoured by members of his profession. He designed and produced a small number of these (expensive) heads.
http://www.j-m-w.co.uk/HJ%20Published%20ArticleNEW.pdf
A different scale to GQ's mate's headless Perrin but it might have some features worth replicating.
BT
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15th April 2011, 03:40 PM #6
I just lost a lengthy and pithy reply.
I like the head Bob linked. I also like Ken's Arboga quill design: it has a regular drill press handle that we all know and love, but it also has a micro-adjust worm feed. It's exactly what we should all have.
And yes, a vertical head is exactly as stated: a horizontal shaft, some bevel gears and a quill. Nice bearing$ too. (or bushings in the case of the early units). Attached is a photo from the Deckel FP-1 spare parts manual of the conventional vertical head. There is also a belt-driven head which is the general scheme of what we'll end up with.
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15th April 2011, 03:47 PM #7
Belt drive vertical head drawing
Here's the Deckel FVV belt-driven high speed head for your amusement. Something like this, scaled up, with the Perrin mounting is where I think we're going.
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15th April 2011, 05:26 PM #8GOLD MEMBER
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As an ex-steel-sales-guy and to take this a little further (and this is purely out of interest), what grade of steel would you be looking to use? Mild steel, hardened or even something like stainless?
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15th April 2011, 06:05 PM #9
No clues in the clues closet, sorry. I'd guess 4140 or similar. Something that would harden up to (again, guessing, 55 RC or so). Grinding to final dimension after HT. But I really don't want to have to start from scratch, but modify an existing unit somehow.
Greg
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15th April 2011, 06:13 PM #10GOLD MEMBER
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I think you'd be right with 4140 however, from memory (deep, dark recesses) welding 4140 is dodgy. The heat alters properties? Not that any components for this application would require welding.
Thanks for the answer though Greg, the question was purely out of interest.
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15th April 2011, 07:00 PM #11.
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Attached are a couple of photos lifted from Tony's site that show the simple fine feed mechanism on a Dore Westbury mill.
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15th April 2011, 09:26 PM #12
That's simple but effective. I like it.
Just thinking about this, I think the way to go might be to fashion a head that fits over the two horizontal support arms on the arbor support. That way change-over would be less fraught with peril, and we'd gain a huge amount of headroom under the spindle.
It appears however that we have some scraping to do first, so that will occupy a long time rigging up a bench, doing a survey and then trying not to make it worse. There's also decisions to be made regarding the missing x-axis feedscrew, attach points, end brackets etc.. This machine is hell-for-stout though, so any effort will have rewards.
GQ
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15th April 2011, 10:01 PM #13Pink 10EE owner
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Spiral gears would be best if you can find some.. plain bevel gears will be noisy...
A quill would be hard to make... The quill housing needs to be honed and the quill ground to fit.... With bridgeports and the like I believe the quills are not interchangable with different machines..
It would be do-able but would require much care..
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15th April 2011, 10:17 PM #14
That's all true, and that's why I am daunted by the prospect of doing this, at least economically, both in time and money. And since we lack an elegant way of getting a horizontal power input, we're going to go with a motor/belt combination. I don't want to contemplate bevel gears-its beyond my nascent engineering skill set.
Greg
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16th April 2011, 02:05 AM #15Product designer retired
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Arrrrah me hardy, what's wrong wiff ya?
If we put our collective heads together, we'll come up with an elegant design that will not only mill steel and aircraft parts, but will double as a coffee grinder and meat mincer.
Just givus a yell, you know the score.
Kennearth
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