Re: [Emc-users] Cutting cast iron with a dry diamond blade

Gene, cast iron is easy to cut, mill and turn because it contains lots of carbon, better known as graphite which is a natural solid lubricant. Using water in addition, if any, is merely for cooling and carrying away the debris. However, if the casting has been cooled very rapidly, it may be sur

Re: [Emc-users] Cutting cast iron with a dry diamond blade

Diamonds will cut just about anything. The trick is matching the matrix holding the diamond bits to the material being cut. I have dealt with diamond drilling quite a bit in my profession (mining of industrial minerals). The harder the materials to be cut, often the better the diamonds like it p

Re: [Emc-users] Cutting cast iron with a dry diamond blade

On 5/10/2016 2:56 PM, Gene Heskett wrote: > On Tuesday 10 May 2016 11:47:13 Dave Cole wrote: > >> I've been doing the controls for a manufacturer of large core drill >> machines for about 10 years. The machines are made to drill holes in >> concrete structures that make up sewer systems. >> The mac

Re: [Emc-users] Cutting cast iron with a dry diamond blade

On Tuesday 10 May 2016 15:41:57 andy pugh wrote: > On 10 May 2016 at 14:28, Roland Jollivet wrote: > > I once watched a contractor dry cut rebar with a diamond blade using > > a cut-off saw. I wanted to tell him you can't do that, > > http://www.husqvarna.com/us/construction/products/diamond-bla

Re: [Emc-users] Cutting cast iron with a dry diamond blade

On 10 May 2016 at 14:28, Roland Jollivet wrote: > I once watched a contractor dry cut rebar with a diamond blade using a > cut-off saw. I wanted to tell him you can't do that, http://www.husqvarna.com/us/construction/products/diamond-blades-for-power-cutters/di5-ductile-iron-blade/ -- atp "A

Re: [Emc-users] OT: lapping machine disc

Interesting that someone else is looking at this subject. A few days ago I dug out an old machine I rescued from factory about to be redeveloped, it has no grooves and also rotation is from above if wanted. http://www.collection.archivist.info/searchv13.php?searchstr=cooke+polishing Dave Caroline

Re: [Emc-users] Cutting cast iron with a dry diamond blade

On Tuesday 10 May 2016 11:47:13 Dave Cole wrote: > I've been doing the controls for a manufacturer of large core drill > machines for about 10 years. The machines are made to drill holes in > concrete structures that make up sewer systems. > The machines can drill up to 60" holes using diamond seg

[Emc-users] OT: lapping machine disc

Hi All I've been looking at lapping machines, like this, and wondered if anyone knew more about the theory of the grooves. While I understand how there is constant velocity on the conditioning ring periphery, if the plate is grooved th

[Emc-users] Cutting cast iron with a dry diamond blade

I once watched a contractor dry cut rebar with a diamond blade using a cut-off saw. I wanted to tell him you can't do that, but he was quite burly, so I left it alone. He said it was a diamond blade, so I'll never know for sure. I presume diamond blades work in cutting reinforced concrete because

Re: [Emc-users] 7mmx1.0 decently hard cap screw, how scarce are they?

McMaster Carr has M7 cap screws. they are "class 12.1" screws made of alloy steel. Not cheap $3 to $7 each. Look them up on-line. They "everything" even aluminum and left hand thread cap screws. -- Mobile security can b

Re: [Emc-users] 7mmx1.0 decently hard cap screw, how scarce are they?

On 5/10/2016 7:27 AM, Mark wrote: > On 05/09/2016 04:49 PM, andy pugh wrote: >> On 9 May 2016 at 18:22, Dave Cole wrote: >>> Andy is probably going to want to stop there and pickup some arms since >>> I heard he is coming to the Detroit area probably to hang out at the >>> Ford glass house. ;-) >

Re: [Emc-users] Cutting cast iron with a dry diamond blade

I've been doing the controls for a manufacturer of large core drill machines for about 10 years. The machines are made to drill holes in concrete structures that make up sewer systems. The machines can drill up to 60" holes using diamond segmented tipped bits. Diamond bits work great for concret

Re: [Emc-users] 7mmx1.0 decently hard cap screw, how scarce are they?

On 05/09/2016 04:49 PM, andy pugh wrote: > On 9 May 2016 at 18:22, Dave Cole wrote: >> Andy is probably going to want to stop there and pickup some arms since >> I heard he is coming to the Detroit area probably to hang out at the >> Ford glass house. ;-) > Actually, I am sat in the office at Rou

Re: [Emc-users] Where to post LinuxCNC issues?

On Tuesday 10 May 2016 01:49:17 Marius Alksnys wrote: > The issue tracker wiki > pagehttp://wiki.linuxcnc.org/cgi-bin/wiki.pl?Trackers refers to does > not accept new issues. Where should I post them? > > In documentation, html/gcode/g-code.html#gcode:g90.1-g91.1: > > G90.1 - absolute distance mod