[TowerTalk] [Bulk] Re: Zerk fitting for MA-40

[Grant Saviers]

For left handed drilling, first you need to hold the drill driver 
backwards or at least left handed.  Then, the chuck will unscrew from 
the drill body if there isn't a left handed screw holding it on in 
addition to the chuck threads, and if that doesn't happen, the Jacobs 
chuck will loosen since it tightens for right handed driving. :-)

To add some actual content, Zerks come in (at least) three flavors of 
fastening

NPT threads; tapered pipe threads 1/8 to 1/4" (maybe bigger, but never 
saw one)
straight threads; commonly 1/4-28 or 10-32 for the small sizes, then 
more larger (usually NF thread series) sizes
press in; ridges on the od to help them stay in place

An Easy-out (left handed) is the easiest for me to remove a broken 
threaded version.  It's pretty common to knock them off construction 
machines.  Usually little or no drilling, maybe a little grinding or 
filing to make the end square/flat, depending on how it was broken off.

A sheet metal body slide hammer (or bearing slide hammer) and hard sheet 
metal screw can remove a broken off pressed in version.

Worse case, drill a new hole (with the shaft removed) and put in a new 
fitting on the other side.  Or take the part to a shop with a ram 
discharge machine, but it needs to fit as the machines aren't large and 
be pretty valuable to be worth the cost.  Or make your own edm, they are 
pretty simple for home use. google home made edm

Grant KZ1W

On 4/10/2015 12:04 PM, TexasRF--- via TowerTalk wrote:
> Patrick, assuming ATF means automatic transmission fluid, a wiki search
> shows there are more than ten different flavors in use. Wonder which one is
> recommended?
>   
> On the subject of left handed drill bits: what would the intended use be?
> Drilling left handed holes? Use with left handed drill motor? Having
> survived  thus far without needing one I am wondering what I have missed out on.
> Since  easy out tools are readily available and most likely a lot more robust
> than left  handed drill bits seems the actual need is not great. Probably
> less expensive as  well and I see one tool fits several size bolts.
>   
> Now that it has come to light that drill bits can be used in place of an
> easy out tool, it seems that there will be no need to buy an easy out tool
> for  reverse threaded bolts; a regular drill bit will work for that purpose.
>   
> Yea, it is a slow day here!
>   
> 73,
> Gerald K5GW
>   
>   
>   
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