MadModder
Gallery, Projects and General => The Design Shop => Topic started by: bp on August 06, 2013, 08:28:01 AM
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I've just finished boring a 34.7mm diameter hole through some 26mm thick free cutting steel. This was such an exciting task that I started to think about the features that make a good boring head. I know that there are lots of designs by smart people but I rather want to have a go at my own, at least designing it.
Broadly, my known requirements are
1/ Usable on my Sieg X2 mill with an MT3 spindle
2/ Have a range up to (say) 40mm diameter with a vertical tool (pre-supposing that "conventional" layout is used)
3/ If built at all, to be built on my X2 mill and C3 lathe
So, it seems to me that the requirements are
1/ Rigidity
2/ Smooth and accurate changes of diameter
3/ Rigid toolholding
4/ As short in "Z" as possible
Anyone got any comments?
Or should I just go and buy a good one, if so what?
cheers
Bill
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I made mine from a blank end arbor , cuts out making the morse taper .
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I am currently making a GHT boring head according to the drawings in his book Model Engineers Workshop Manual. I am right now waiting for an M6x0.5 mm tap and plan to screw-cut the feed screw with the mating thread. That way one turn on the dividing head makes 1 mm on the diameter of the bore. makes for simple maths I think.
(http://i577.photobucket.com/albums/ss219/H0n3/Tooling/GHT-BoringHead/GHT-BoreHead-03.jpg)
I have an SX1L mill, that is one number smaller than yours bp. Normally I have a 2MT to ER32 head in the spindle so I made a plain 12 mm stem for my boring head.
Oh yes, if you think this head is useful, a material kit is available from Hemingway in the UK.
BR
/Peter