Re: [Emc-users] Tap Hat photo

2018-03-07 Thread Gene Heskett 
On Wednesday 07 March 2018 06:57:58 Erik Christiansen wrote:

> On 07.03.18 05:45, Gene Heskett wrote:
> > On Wednesday 07 March 2018 02:00:46 Erik Christiansen wrote:
> > > To go in a collet, you wouldn't need the fat splined adapter to
> > > take the die holder. I can take this one off as it's only held on
> > > with grubscrews. Two of the four tap-gripping grubscrew holes can
> > > be seen half way up the tap holder body.
> >
> > And you intended to make one for every tap size you commonly use?
> >
> :-) That's why the adaptor for the die holder is only attached with
>
> grubscrews. Four or five 1/2" holders, one for each tap that I use,
> then drop in to one adaptor. And the holders are quick to make. (I
> have some zero rake carbide tipped drill bits. Medium fine brass
> granules just pour out the flutes of the horizontal drill in a golden
> river, without any need to back out before it's done. And you can feed
> at a most gratifying rate.)
>
> I'll have to buy some larger brass bar for holders for 8 mm and up, or
> just use steel, which isn't as much fun.
>
> Erik
>
I have an ER-40 kit that will pass a 7/8" rod, maybe even an inch, but my 
R8's quit at 7/8", so I just ordered 6 foot of 7/8" #360 brass rod. Now 
I need to round up grub screws, and some short 3mm cap screws as I am 
going to sacrifice a 7/8" R8 by grinding a notch in it for the head of a 
3mm cap screw seated deep. Since the R8 is pinned, why not pin the 
adapter?  And with 7/8" of brass, 3mm grub screws ought to get a decent 
grip on the taps butt for smallish taps. For bigger taps, increment the 
grub screw. Figure the grub screw diameter as close to the width of the 
flat w/o exceeding it.

Straight flute drill bits sound good too. But I've not acquired any of 
those yet. :( But they are on my wish list. And maybe add a couple 
lincurves and offsets to the mill, keyed to a home switch on the table 
that doesn't exist yet. That should keep me busy... Better yet, make a 
jig to bore the grub screw holes. I like that better, as this 4" table, 
even with a motor on it, is a P.O.S., with little or no ability to 
center a 3 jaw thats mounted on it.

Sitting here, watching the snow coming down in BIG flakes at a 45 degree 
angle, but not sticking yet as its 36F, I don't think I'll go see the 
Missus today as she just called and warned me to stay home. So I guess 
I'll go fix a bite, and call it breakfast.

Thanks Erik.

-- 
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Tap Hat photo

2018-03-07 Thread Erik Christiansen 
On 07.03.18 05:45, Gene Heskett wrote:
> On Wednesday 07 March 2018 02:00:46 Erik Christiansen wrote:
> > To go in a collet, you wouldn't need the fat splined adapter to take
> > the die holder. I can take this one off as it's only held on with
> > grubscrews. Two of the four tap-gripping grubscrew holes can be seen
> > half way up the tap holder body.
> >
> And you intended to make one for every tap size you commonly use?

:-) That's why the adaptor for the die holder is only attached with
grubscrews. Four or five 1/2" holders, one for each tap that I use, then
drop in to one adaptor. And the holders are quick to make. (I have some
zero rake carbide tipped drill bits. Medium fine brass granules just
pour out the flutes of the horizontal drill in a golden river, without
any need to back out before it's done. And you can feed at a most
gratifying rate.)

I'll have to buy some larger brass bar for holders for 8 mm and up, or
just use steel, which isn't as much fun.

Erik

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Re: [Emc-users] Tap Hat photo

2018-03-07 Thread Gene Heskett 
On Wednesday 07 March 2018 02:00:46 Erik Christiansen wrote:

> Hi Gene,
>
> Here's a posed pic with die holder removed for clarity, showing the
> Tap Hat aligned vertically by a centre drill. (Imagine that the chuck
> is still over a hole just drilled in a clamped-down workpiece, with
> the drill bit swapped for the centre drill for the next hole in a
> sequence, since it's more rigid and convenient than the longer drill.)
> You'll need to zoom in a bit to see the detail.
>
> To go in a collet, you wouldn't need the fat splined adapter to take
> the die holder. I can take this one off as it's only held on with
> grubscrews. Two of the four tap-gripping grubscrew holes can be seen
> half way up the tap holder body.
>
And you intended to make one for every tap size you commonly use?

> It may be that in addition to using the largest diameter for which you
> have a collet, using brass might increase grip, as the steel collet
> can impress its micro-roughness on the brass, even if only as elastic
> deformation, rather than slipping on a harder steel surface. (Pure
> theoretical mental-coggery, but perhaps worth the experiment.)

Note in that regard already made, just haven't verified it yet.

> Best of luck in avoiding expensive solutions.
>
> Erik

Looks interesting, and doable.  Thanks Erik.

-- 
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

--
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