Machinest Question

A special section just for steam engines and boilers, as without these you may as well fit a sail.
Oilking
Full Steam Ahead
Full Steam Ahead
Posts: 186
Joined: Sun Sep 02, 2012 2:39 pm
Boat Name: No Boat Yet
Location: Cathlamet, WA

Re: Machinest Question

Post by Oilking » Sun Aug 02, 2020 4:48 pm

Check out https://www.speedtaps.com/. These are taps made for use in an impact wrench. Haven't used them myself so I can add no more to what they say.
Dave
User avatar
fredrosse
Full Steam Ahead
Full Steam Ahead
Posts: 1906
Joined: Fri Nov 20, 2009 5:34 am
Boat Name: Margaret S.
Location: Phila PA USA
Contact:

Re: Machinest Question

Post by fredrosse » Mon Aug 03, 2020 2:07 am

Couldn't help but notice the comparison:

On the left, an overweight guy with beard and tattoos struggles with a conventional tap wrench, on the right a blonde babe using the speedtap like a pro. Pretty (pun intended) advertising ploy that is a bit too obvious.
Oilking
Full Steam Ahead
Full Steam Ahead
Posts: 186
Joined: Sun Sep 02, 2012 2:39 pm
Boat Name: No Boat Yet
Location: Cathlamet, WA

Re: Machinest Question

Post by Oilking » Mon Aug 03, 2020 4:02 pm

Ya, Fred the demo was a bit over the top. This is the one I wanted to post, but couldn't find at the time: https://www.youtube.com/watch?v=96LwwycOhPI
I little more down to earth from a guy down under.

Dave
Mike Rometer
Full Steam Ahead
Full Steam Ahead
Posts: 936
Joined: Sat Aug 13, 2011 6:41 pm
Boat Name: B.N.Y.S.
Location: Middle Earth

Re: Machinest Question

Post by Mike Rometer » Mon Aug 03, 2020 8:20 pm

They look more like a second cut, than a first. Look to do the job though.
Retirement is about doing what floats your boat!

A BODGE : - A Bit Of Damn Good Engineering.
User avatar
DetroiTug
Full Steam Ahead
Full Steam Ahead
Posts: 1863
Joined: Fri Nov 27, 2009 5:56 pm
Boat Name: Iron Chief
Location: Northwest Detroit

Re: Machinest Question

Post by DetroiTug » Tue Aug 04, 2020 1:42 pm

Impact gun on a very brittle tap.. That would be like using an air chisel to drive a broach. It could work until something binds and then ''tick''.

-Ron
User avatar
Lopez Mike
Full Steam Ahead
Full Steam Ahead
Posts: 1903
Joined: Wed Dec 07, 2011 6:41 am
Boat Name: S.L. Spiffy
Location: Lopez Island, Washington State, USA

Re: Machinest Question

Post by Lopez Mike » Sun Aug 09, 2020 1:36 am

I prefer the first video. Not so hot on the head banger music.

I've had production jobs where I had to tap hundreds of 5/16" holes in 1/4" 6061 aluminum. Used a two flute spiral point tap with no lube and I still have the tap. Used a hand held electric drill.

Of course high strength aluminum is about the easiest stuff to tap that there is.

As I've commented before, it helps to go oversized on the drill size. 50% thread engagement is fine. The strength penalties compared to the standard 70% are minor. Unless you tapping into warm butter the bolt will fail before it will strip out usually.
If you think you are too small to make a difference, try sleeping with a mosquito.
Dalai Lama
Post Reply