[Public-List] Damn screws

[americo silva]

i see hate when that happens
maybe an adapter

On Mon, Jun 4, 2018 at 12:51 PM, Michael Connolly via Public-List <
public-list at lists.alberg30.org> wrote:

> George,
> You can perhaps make an adaptor to fit the bit to the impact driver. This
> would be helpful in the future.
>
> Also, what is more important to you the aluminum casting or the rubber
> diaphragm? If the diaphragm is easily and at reasonable cost replaced. Then
> definitely go with heat. I assume that to replace the casting means
> replacing the pump. Using heat, heat only the aluminum near the offending
> screw. Lots o'heat then let air cool. You can do this several times. I have
> also used a thread loosener along with the heat. Take your bit that fits
> and place in screw slot and tap it hard while heating. Repeat several times
> with heat and thread loosener.
>
> Failing this. What do you think the diameter of the screws is? #10 or
> 1/4"? Place aluminum casting on base of drill press and secure level as
> possible = perpendicular to the screw. File off the head, center punch and
> starting with new 1/16" bits, drill down thorough the screw. You might need
> a handful of new bits for each screw. Dull drill bits will just go sideways
> esp. in stainless, so use new bits. If you can, drill right through the
> screw into the cavity beyond the screw body. Increase the size of the bit
> until you reach the size of the original screw = valleys of the threads.
> Then use a needle pick and pick out the threads which remain. Sometimes you
> can get all the threads out. Otherwise just get the first couple of
> threads. Then start a new tap of the correct size and carefully remove the
> old threads being careful not to cut new threads. The idea to drill right
> through the screw into the cavity below is so one can use compressed air or
> thread loosener to blast out the debris a
>  s it accumulates. Removal of debris is critical to this operation.
> Accumulations of debris will jam the tap and cause the tap to rip out the
> original threads in the aluminum casting. Most of the time these screws go
> into a blind hole. Sometimes the hole is deep enough or can be deepened to
> allow you to cut new threads in the lower portion of the hole if the upper
> threads are messed up and your new screw won't tighten up. You will need to
> purchase a bottoming tap or make one by grinding off the end of a tapered
> tap. Always begin with the tapered tap and follow with the bottoming tap.
> Cleaning out debris as you go.
>
> Michael................hang in there.
>
> ----- Original Message -----
>
> From: "George Dinwiddie via Public-List" <public-list at lists.alberg30.org>
> To: public-list at lists.alberg30.org
> Cc: "George Dinwiddie" <gdinwiddie at alberg30.org>
> Sent: Monday, June 4, 2018 8:11:29 AM
> Subject: Re: [Public-List] Damn screws
>
> On 6/3/18 9:54 PM, americo silva via Public-List wrote:
> > screw bits are not that expensive must b a hardeware store around
>
> Oh, I've got screw bits that fit the screw, but they don't fit the
> impact driver.
>
> --
> ----------------------------------------------------------------------
> When I remember bygone days George Dinwiddie
> I think how evening follows morn; gdinwiddie at alberg30.org
> So many I loved were not yet dead, http://www.Alberg30.org
> So many I love were not yet born. also see:
> 'The Middle' by Ogden Nash http://idiacomputing.com
> ----------------------------------------------------------------------
>
>
>
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