Which Boring Head To Get For A Mill?

Alittlerusty

Alittlerusty

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Hi all, I need(want) to purchase a boring head and boring bar set for my mill. Can anyone recommend a decent mid price brand with some insight . I can't see buying high end for my farm shop and don't want junk that will ruin my parts. The first project for the head will be to enlarge pin bushing seats on my mini excavator( bucket links, stick, boom etc) the kubota parts r priced insane so intend to resize to common size pins and bushings which can be bought at 1/7 the price of oem. I will be boring steel not alum or brass and don't know the hardness yet but figure replaceable carbide inserts on the bars would be a good idea . Thanks in advance for your help!
 
I bought a kit off eBay for $80. It has the carbide brazed on but you could make your own indexable or buy them later. It being the only one I've ever used I don't have anything to compair it to but the screw seems a little slopy to me but works just the same.
 
In addition to considering a purchase, consider making your own. I've posted some links below. Based on the low cost heads that are available it may be cheaper to buy one. However, there is a thrill associated with building your own. Note I am not necessarily recommending any particular one of these links nor would I limit you from looking for other plans.

http://www.projectsinmetal.com/free-metalworking-project-plans-adjustable-boring-head-mill/

http://homepage3.nifty.com/amigos/boring_head/boring_head-e.htm

http://home.kleppnett.no/thorhansen/m/BoringHd.pdf

http://www.deansphotographica.com/machining/projects/mill/boring/boring.html

Regardless, happy chips!
Daryl
MN
 
Thanks for the replies! Barely have time to wipe the sweat off my face most of the time. So I will be buying one at first , guess I'll try one of the import ones and see if it holds up as King said I can always go big later if necessary.
 
Are we talking hard bushings or soft bushings? For hard you will need the carbide anyways. For soft you should be able to use a hand reamer & HF has those for cheap. I've been eyeing them for a few years.

Warning with the boring head. I calulated the spindle speed fo the hole sive I was boring & probably not more then .02" in the hole it started screaming like it was going to fly apart. I guess these need turned much sloer because of the offset rocking the machine. IDK
 
I will be buying hardened greasable bushings but will be resizing the bores they sit in for a press fit.i don't think the bores are hardened just the bushings are.kubota makes theirs an odd size so u have to buy from them.
 
Oh. I read it as you were boring the bushings. Your boring before pressing the bushings in.

How many do you have to do. Are they going to fit in your mill?
 
I've got about 20 to do but will be doing 4-6 at first on the worst ones. The machine is tiny ( will fit thru a 3 foot door). The stick or arm is only 3 feet long or so and the boom is maybe 5 feet long. Pretty sure I can get either on the mill.
 
My mill is a t- head bridgeport so I can slide the head left or right but there isn't any nod on the machine
 
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