[Public-List] Damn screws

George Dinwiddie gdinwiddie at alberg30.org
Mon Jun 4 10:08:14 PDT 2018


Thanks, everyone, but I've got enough rat-holes without building custom 
tools or trying to drill out a stainless machine screw at an arbitrary 
angle. I don't need more yaks to shave.

I just want to pump out the bilge.

On 6/4/18 1:04 PM, americo silva via Public-List wrote:
> 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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-- 
  ----------------------------------------------------------------------
   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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