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Thread: Sourcing Bright Flat Steel Bar
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24th September 2014, 10:00 AM #1Intermediate Member
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- Apr 2014
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Sourcing Bright Flat Steel Bar
Hi,
I have a small project underway to fit a new QCTP to my lathe, where I need some 120 x 15mm (approx) flat bar about 300mm length, all I have managed to obtain in Melbourne is flat black hot rolled steel with that hard crust on it, I have milled that off but the finish is not great.
Does anyone know where in Melbourne to get small lengths of bright in those approximate dimensions
Thanks..
Eric
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24th September 2014, 01:57 PM #2
What about Interlloy http://www.interlloy.com.au/
They have S1214 http://www.interlloy.com.au/our-products/bright-steels/
Not sure about minimum orders, you might scout out local engineering businesses and ask for a look in their scrap bin.
Ray
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24th September 2014, 04:06 PM #3Senior Member
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Steel Supplies
Try Rimsteel in Braeside. They will cut to length for you.
Roger
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24th September 2014, 06:23 PM #4SENIOR MEMBER
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24th September 2014, 06:36 PM #5GOLD MEMBER
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24th September 2014, 07:07 PM #6
steel
Eric
This business will have what you need
http://www.ian-stansfield-smith.com.au/
The 1214 resulphurized free machining stock has a pink colour code
The 12L14 leaded stock has a purple colour code
They have it in round square and other shapes
Mike
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25th September 2014, 11:12 PM #7Intermediate Member
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- Apr 2014
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- N.E. suburbs Melbourne
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Thanks for the feedback everyone,
I will be ringing around each of those companies to see what they offer.
I am just learning this game myself so prefer to learn the hard way by doing it myself, thanks anyway.
However... the face mill I was using is a 64mm dia 4 insert hss cutter that came with the Titan TM250v mill I receintly bought, it kept jamming during the cut, so I'm probably not using it correctly.
What I did do however was to remove 3 of the 4 cutters and use it as a fly cutter and that was a vast improvement in finish and speed & feed.
Now I just need to learn more about speeds feeds sfm etc, cannot seem to get it to sink in.
Eric
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26th September 2014, 08:11 AM #8Philomath in training
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- Adelaide
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Speeds
The easy questions at last!
Cutting speed (rpm) = (300 x material surface speed )/diameter
Diameter is the diameter that the cutting is taking place - either the diameter of the part on the lathe or the diameter of the cutter on a mill or the bit diameter in a drill press.
Material surface speed varies by material. For normal steel it is 30m/min, Al, brass, thermo plastics is around 90m/min, tool steel, cast iron, S/S, bronze around 15m/min
I normally use it by saying rpm= 9000/Diameter and then multiplying by 1/2 or 3 or what ever depending on material. I find that easier to remember.
This is the formula for HSS - carbide has higher surface speeds (normally in the catalogue). Again, I normally just multiply by 4 or so.
The surface speed numbers have been worked out empirically so you will see some variation in reference books for this figure. They are based on maximum tool life for best metal removal rate in an industrial setting. Go faster and you will be sharpening tools a lot more often, slower is fine although you may not get as good a finish on some things.
Industrially, feeds are as fast as you can get away with for surface finish and machine power. In a home workshop it becomes what you are comfortable with.
With respect to your multi tip cutter, check the sharpness of the tips and that they are all set the same distance from the body. Depending on the power of the mill, you may not be able to manage much in the way of depth of cut (DOC). Some times it is a matter of getting a lump of material and experimenting. For a mill with 10's of hp you would could be talking multiple mm, for a fractional hp machine it may stall with say 0.2mm DOC.
Michael