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1040 Steel

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Dave Tointon	16/04/2010 09:06:54
49 forum posts	G'Day all, I went to my steel supplier after a foot of 75 mm bright mild steel, Making a ball turning attachment. He only had, as he termed it 1040, apparently a medium tensile stuff. It turned up nicely but I'm trying to mill a 16mm slot across the top and finding it a bit tough. I'm using an indexable TC tip slot drill lots of coolant but find anything over a 1mm cut is beyond the caapability of my round column Chinaman. 2. Questions Please. Is 1040 good stuff and any tips on machining the stuff?? Regards Dave Tointon
Julie	16/04/2010 09:45:21
24 forum posts 1 photos	It is a standard steel basically it is EN8 in BS970 (1955) or 80M40 in the newer definitions of BS970. It is medium strength unalloyed steel. It is usually used for stressed pins and shafts It ain't as easy to turn/machine as EN1 by a long way - if one looks at machinability indexes EN1 is 100 whilst EN8 is something like 45. A good round tool - loads of suds etc and it turns OK With milling, lots of small cuts and a carbide tool is best. The big issue is that it is very heat treatable, so if you generate too much heat at the cutting surface it ends up hardened! - even a slight bit of heat and rapid cooling (such as the mass of the workpiece) and it is harder than the rest. Julie
KWIL	16/04/2010 09:58:05
3681 forum posts 70 photos	A 1mm cut x 16mm dia is not a bad performance by any standard, just need more of them. How deep are you going?
Dave Tointon	16/04/2010 11:28:42
49 forum posts	Depth of slot is about 25mm. I'm basically winging it. When she looks right and the previous bit fits. then she's right!!! I'd have thought that the machine would cope with at least an eighth of an inch cut Thank you for the advice Regards Dave
Circlip	16/04/2010 11:34:08
1723 forum posts	Was going to ask if this is based on the Steve Bedair design? If so, if you look on the edge of the outside dia. of the turntable block, can't you IMAGINE a hole drilled across the dia. (Say 15mmDia.)?? A couple of vertical saw cuts gets rid of MOST of the "Scrap" so you just have to clean up the slot. Not unique but so many newer members will try to CLEAVE big lumps of scrap metal out with a milling cutter. Regards Ian.
JasonB	16/04/2010 12:56:10
25215 forum posts 3105 photos 1 articles	Or just drill a series of vertical holes to remove a lot of the waste J
Dave Tointon	19/04/2010 00:17:21
49 forum posts	Thanks for the advice Circlip. I had thought of drilling a hole through the side but thought I'd have a go milling the complete slot. I have to keep reminding myself these days that the foreman won't be breathing down my neck because the job is taking a long time. Regards Dave
Circlip	19/04/2010 11:54:47
1723 forum posts	Aye, and don't forget, the FOREMAN ain't paying for the cutters now. Regards Ian.

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