Product
Boring is where overhang, centre height and clamping rigidity stop being theoretical. These holders locate the bar properly and keep it there through the cut.
Best for
Boring on turret lathes and vertical turret lathes
You send
Holder designation, bar shank, bore diameter and depth
You get back
Holders that locate the bar on centre and hold it
How it starts
Reach checked against bore depth before manufacture
The situation
Almost always a rigidity chain problem, and the holder is usually the weakest link in it.
What you get
Holders for stable boring with square-shank and micro-boring tools.
The machine interface, tool interface and working envelope are checked before manufacture, so boring holders arrive ready to run.
Supplied from range where a standard suits the job, made to order where it does not, or reproduced from your sample where the original is unavailable.
Locating and clamping features are ground and the dimensions governing runout and repeatability are inspected before dispatch.
Repeat orders and modifications are handled in Bengaluru rather than through an import cycle.
BCA, BSA and BSB designations cover holders for boring bars used on vertical turret lathes and turret lathes in the HMT tooling system. They locate the bar on centre and provide the clamping to resist the radial loads of boring, which matter most at longer reach.
Holders for a range of square and round bar shanks and bore sizes. The verified designation and size table follows CMTA's confirmation.
Match the holder to the turret slot, the bar shank size and the bore diameter, then confirm reach against bore depth so overhang is no greater than the job needs.
Alloy steel, heat treated, ground on locating faces and bar seat, and inspected for centre height and squareness.
Before you enquire
The inputs that make a useful review, plus the related pages worth reading first.
FAQ
The questions engineers and buyers ask before sending a drawing. If yours is not here, ask it directly — you will get an engineer's answer, not a brochure.
Still have a question?
Talk to Anita M.N, Managing Partner, or send the drawing and let the review answer it.
Holder type (BCA, BSA or BSB), Tool size or bar shank, Bore diameter, Reach or depth of bore, Machine and turret details. If you are unsure of any of these, send a photograph of the current holder and the machine nameplate — that is usually enough for us to confirm the rest.
Yes. Variations in length, reach, interface, clamping or tool size are manufactured to order. Fully custom variants go through the custom tool holder process, with a drawing approved by you before manufacture.
Against three things: the machine interface, the tool interface and the working envelope. Where an existing item is being replaced, matching it to your sample or original part number is the most reliable route of all.
Yes. A drawing is manufactured to its stated tolerances; a sample is measured and reverse engineered into a drawing for your approval, and then manufactured.
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