There's a saying "It is not over until the fat lady sings" now for us
here it reads "It's not over until Andy has chipped in his bit". Just to
keep us all on our toes and in line. Thanks Andy, very useful
information and it just serves to make one feel confident from the start
that you are not wasting your money on another failed attempt at
building a special machine.
------ Original Message ------
From: "andy pugh" <bodge...@gmail.com>
To: "Marius Liebenberg" <mar...@mastercut.co.za>; "Enhanced Machine
Controller (EMC)" <emc-users@lists.sourceforge.net>
Sent: 2018-04-02 21:44:36
Subject: Re: [Emc-users] What RPM
On 2 April 2018 at 15:23, Marius Liebenberg <mar...@mastercut.co.za>
wrote:
The spindle in the picture is what is currently fitted to the machine
and I
would like to refurbish and use it. The question I have is what RPM
will I
be able to run the spindle seeing that it uses these brass bearings?
My Rivett lathe is good for 1600rpm and has similar bearings. Your
bearings look smaller, and therefore can go faster.
The internet says:
"Depending on material max shaft speed 1.25 to 5m/s
(non leaded bronzes, up to approx 2.5m/s)"
If the shaft is 25mm dia then 2.5m/s = 31 rps = 1900rpm.
(the extremes give 950 to 3800 rpm.)
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916
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