|
Posted by Neil Ellwood on October 1, 2006, 2:31 pm
Please log in for more thread options On Sun, 01 Oct 2006 18:39:54 +0100, Norman Billingham wrote:
>
>>
>> I need to drill a (fairly) accurate 5mm hole in aluminium to hold a 5mm
>> silver steel rod, which will be acting as a pivot. I thought silver
>> steel was fairly accurately cut to diameter, so I first drilled a 4.9
>> mm hole in the aluminium as I read that drill bits tend to cut
>> oversize. The s.s. wouldn't fit, wouldn't even enter the hole. So I
>> opened the hole out to 5mm. Still wouldn't enter (and a micrometer
>> check on the s.s. showed it as about 4.97 mm). A tiny touch of filing,
>> still no fit. In the end I had to use a 5.1mm drill before I could get
>> the s.s. through. What gives? Should I invest in a 5mm reamer?
>
>
> Invest in a 5 mm reamer. Drill 4.8 or 4.9 mm and ream. The silver steel
> will fit beautifully. Run the reamer about half drilling speed and use
> plenty of lubricant.
>
> Only problem is that good 5mm reamers are not cheap so if there's only one
> hole to do I'd try to borrow one.
Don't forget to break the corner of the silver steel as this can make
entry difficult.
--
Neil
Delete l to reply
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
> I need to drill a (fairly) accurate 5mm hole in aluminium to hold a 5mm
> silver steel rod, which will be acting as a pivot. I thought silver
> steel was fairly accurately cut to diameter, so I first drilled a 4.9
> mm hole in the aluminium as I read that drill bits tend to cut
> oversize. The s.s. wouldn't fit, wouldn't even enter the hole. So I
> opened the hole out to 5mm. Still wouldn't enter (and a micrometer
> check on the s.s. showed it as about 4.97 mm). A tiny touch of filing,
> still no fit. In the end I had to use a 5.1mm drill before I could get
> the s.s. through. What gives? Should I invest in a 5mm reamer?