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Small (broach) press. Hydraulic or mechanical?

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Lew_Merrick_PE:
Pekka,

Not knowing your shop, I would have assumed that such work would be done on a milling machine.

One thing to keep in mind is that a drill will follow an existing hole.  A boring end mill (an end mill that has been ground to dull the circumferential edges) will generally allow you to move a hole a bit without the following effect.

With respect to the boring head, what I am talking about is the insert boring bar.  They usually have a slip-fit cylindrical end that fits into the boring head, an offset taper between the fit cylinder, and a circular cutting end that extends out beyond the tapered leg.  It is the circular cutting end that can be increased in size to gain you some throw to enlarge your range.

With respect to tooling buttons, the first set I made as an apprentice were made from ø.500 inch drill rod (silver steel).  Five of the button bodies were made to be .500 inch long and one was made to be .875 inch long.  The .875 inch long one was my zero basis (so I would always know which button represented my zero position).  The buttons were drilled & reamed to ø.250.  I then used #10 (.190 inch major diameter) Button Head Socket Cap Screws as the clamps.  I mounted them all on a piece of (drilled & tapped) steel bar to keep them together.

Over the years I have made sets of tooling buttons with clamp screws ranging from #0 (.060 inch major diameter) up to .375 inch major diameter.  My more recent sets were made from A1 (air quench) tool steel bar to reduce post heat-treat warpage.  I have an appropriately ground boring end mill with each set.

PekkaNF:
You are right on that. Drills tend to folow previous hole and reamer follows the hole.

I have to rethink this. I have milling machine and I have history of getting holes skewed even though I think I have trammed head.

I was cutting 100*100*12 mm angle iron, about 700 mm long and managed to drop it to my toe. I had been wearing steel tip shoes for 20 years and they go old. Transhed them and didn't got round buying new one. I can tell running soes offer very little protection.

Pekka

Sid_Vicious:

--- Quote from: PekkaNF on April 20, 2015, 03:23:14 PM ---I can tell running shoes offer very little protection.

Pekka

--- End quote ---
I know, Bin there done that :beer:

RodW:

--- Quote from: PekkaNF on April 19, 2015, 02:56:39 PM ---
I have idea how to put three holes (each part) on same line on four parts. Only two parts are same size, other two are unique. I'm thinkking of using the largest piece as a jig and finishing it last.

Pekka

--- End quote ---

After experiencing the same problem, I went looking for Transfer screws and transfer punches. The transfer screws are very cool but hard to find. You can get both from here

http://littlemachineshop.com/products/product_category.php?category=1438824943&First=T&Last=U

PekkaNF:
My toe is very purple and swollen all over. They said it should be better in 3/4 weeks.

Thanks for the transfer punch idea, I'll have to consider that.

I always though that transfer punches are accepted marking out clearance hole / thread holes and such, I'm such a kloz that I probably would bugger something and would add too much error.

Pekka

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