Goofs & Blunders You Should Avoid.

Mauzinette said:
I was chopping firewood earlier today and learned that ribbed pine borer beetle larvae bite like hell :eagerness:
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Not surprised, our western pine borer larvae have an imposing set of mandibles and can be heard munching under the bark from 50 ft. away.
Never heard of someone being bitten by one though, they don't move that fast. The yellowjackets love 'em, they tend to be drawn in to the smell of fresh split wood.
 

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So there I was saving the day…..

We’re slammed at work so I got pulled in to doing some die repair and ran into a problem, no spare punches to put in place of the busted ones.

Being the old head in the shop I decided to go old school and make one out of a blank, and I did a damn fine job too, then I realized my mistake.

Can you see it?

Forced perspective is making the punch in the back look shorter than it really is. It’s actually .200 longer than the old one in the foreground.

This started out as a solid .500x3.25” blank.

Sooo close!






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ETA: old punch body is 7/16, the one I made is 1/2”.

This is the only 7/16” punch we use in any die as it was a replacement for a 3/8” punch where the retainer was damaged.
 
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Watch out for big keyless chucks, small drill bits, and high speeds! Ended up with a gnarly cut on my finger when a bit went flying.

Keyless chucks self-tighten under drilling torque but loosen under spindle deceleration torque. Small bits mean higher speeds and less drilling torque; electronic spindle braking gives higher torque at higher speeds, easy for the chuck to open up and the bit to go flying.

Options seem to be use a smaller chuck, use a keyed chuck, or use variable speed to slow the spindle before turning it off.
 
We posted about this somer time go...

Launched a 1/16 bit across the shop once, then tried to touch the shell on another and paid the price.

We now use the spindle brake to hold the spindle and tighten the chuck.

Works well, they stay put.

Sent from my SM-G781V using Tapatalk
 
jaek said:
Watch out for big keyless chucks, small drill bits, and high speeds! Ended up with a gnarly cut on my finger when a bit went flying.

Keyless chucks self-tighten under drilling torque but loosen under spindle deceleration torque. Small bits mean higher speeds and less drilling torque; electronic spindle braking gives higher torque at higher speeds, easy for the chuck to open up and the bit to go flying.

Options seem to be use a smaller chuck, use a keyed chuck, or use variable speed to slow the spindle before turning it off.
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that's one of the things I never had happen to me when I used my keyless. I've been back to jacobs all around except on my drill press.
I really wonder if it were tight. These don't usually loosen unless you are rotating it in reverse.
 
I love keyless chucks, but they are not a one size fits all solution. It's important to size the chuck to the drill for that very reason. Maybe years of using keyed chucks and cordless drills have deluded us into thinking if it fits, it's good, but that's not the case with these.
 
T Bredehoft said:
I've found that seating the back end of the drill bit in the back of the chuck makes centering the drill bit a little easier. Of course, if the drill is shorter than the depth of the chuck this doesn't work.

In the spirit of blunder. I have had the following experience. I needed to drill two .040 holes in a piece of aluminum, 3/16 thick. After breaking three or four drills I realized that the hand feed on my mill was not sensitive enough for me to feel when the bit was in aluminum, and i'd jam it into the material before slowing the feed. Talk about ham handed.
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If I read correctly, a drill bit that small should be turning most efficiently at close to 9000rpm -- tough to do on most drill presses. I found this gem on ebay, which makes your drill press a lot more sensitive because you can feel the bit advancing with your fingertips. I don't use it much but on occasion it's pure gold. I have no idea what it's called.
T Bredehoft said:
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Our fastest large mill tops out at 10K rpm. We have three smaller mills with a max of 60k (claimed). We do run them flat out most of the time while using .020” and .012” micro mill bits. We have not spent the $$$$$ for the 100k spindle!
For a regular drill press one could use an air spindle for the small drills and milling bits. Not cheap but can be found used.
Pierre
 
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