2014 POTD Thread Archive

[rock_breaker]

Made some button cutters to shape a gear cutting fly cutter. Many things left to do befor attempting to cut a gear however.
Chased a ground hog out of the pick-up engine compartment that the dog had cornered.
Have a good day
Ray

 

[Marco Bernardini]

It wasn't a project, but a necessity.
I had to tighten some M3 nuts, requiring a 5.5 mm wrench.
In the wide collection of greasy and rusty wrenches wifey inherited from her dad there wasn't a 5.5 mm wrench ("half measures are for sissies" he always told - probably because Piaggio never used M3 bolts and he was of the Bigger Hammer school).
So I took the thinnest 6 mm wrench, placed it in the vise, heated it with a Bic lighter for some minutes - it helped a bit - and got a 5.65 mm wrench, good enough for those pesky microscopic nuts.
Probably to file a 5 mm wrench would be easier, but I have just one, while there was a fistful of 6 mm coupled with the 7 mm for the M4 bolts, so I preferred to keep the 5 mm one in its native size.

 

[Don B]

It wasn't a project, but a necessity.
I had to tighten some M3 nuts, requiring a 5.5 mm wrench.
In the wide collection of greasy and rusty wrenches wifey inherited from her dad there wasn't a 5.5 mm wrench ("half measures are for sissies" he always told - probably because Piaggio never used M3 bolts and he was of the Bigger Hammer school).
So I took the thinnest 6 mm wrench, placed it in the vise, heated it with a Bic lighter for some minutes - it helped a bit - and got a 5.65 mm wrench, good enough for those pesky microscopic nuts.
Probably to file a 5 mm wrench would be easier, but I have just one, while there was a fistful of 6 mm coupled with the 7 mm for the M4 bolts, so I preferred to keep the 5 mm one in its native size.

I fly RC helicopters, all small metric stuff, a couple of times when I didn't have the right nut driver I used the head of a socket head cap screw as a nut driver, works good, if you need a wrench drill a hole in a piece of something the same size/under size as the OD of the SHCS, press it in, grind the extra off.)

 

[Marco Bernardini]

I fly RC helicopters, all small metric stuff, a couple of times when I didn't have the right nut driver I used the head of a socket head cap screw as a nut driver, works good, if you need a wrench drill a hole in a piece of something the same size/under size as the OD of the SHCS, press it in, grind the extra off.)

Good suggestions, thanks!
But tomorrow I'll buy a 5.5 mm wrench: I started the job (a steel cable to support the vineyard… all stainless!) late in the afternoon, and when I arrived at the M3 nuts the shops were closed.

 

[Chucketn]

I have made custom wrenches/nut drivers from Socket Head Cap Screws and brass tube that the screw just fits into. Solder in the screw and make a custom wood handle like a file. Lst one was for 2-56 hex head screws from an imperial SHCS.
Chuck

 

[ddmunroe]

Re: POTD Surprise attack from my milling vise !

I needed to mill mild steel block today
50 mm x 49 mm It had to be as accurate as I could get it.
I decided to use another vise I had to see how accurate it was. It has no name.

My first pass found .004 inch taper in the Y axis, after some investigation I found the stationary jaw of the milling vise was leaning .002"
Top to bottom not in the x axis (this I indicated earlier in setting the vise on the mill)
I took off the hardened bolt on jaw and ran an end mill across the casting face to clean up.

I put it together and still had .002 taper :thinking: in the Y axis
I then found the movable jaw was kicking up one edge. Solved this with a lathe boring bar.
The 4th pic down was a sweep after a cut, the indicator did not move so I knew it would be square.

The block turned out "so" square it surprised me.... max variation was .01 mm / .00039 " or less all over. This was achieved by taking .003" final cuts

Some pics.
dd

 

[Marco Bernardini]

Re: POTD Surprise attack from my milling vise !

The block turned out "so" square it surprised me.... max variation was .01 mm / .00039 " or less all over. This was achieved by taking .003" final cuts

If I'd get such precision my first thought would be «The indicator is stuck» :biggrin:
Nice job!

 

[ddmunroe]

Re: POTD Surprise attack from my milling vise !

If I'd get such precision my first thought would be «The indicator is stuck» :biggrin:
Nice job!

:lmao: at one point the thought did occur
cheers
dd

 

[jumps4]

Today I remade 2 of the original engine parts on my model. one was broken the other was just plain ugly.
making the parts pics are in my build thread here
http://www.hobby-machinist.com/showthread.php?t=6463&highlight=yulee
Thanks for viewing
Steve

 

[tony montana 2]

Took the first cuts with my new mini mill that arrived last week. now I need to make some non-metric T-nuts.