Carbide drill VS indexable drill

[kalmah]

Just one question:

Do you use carbide twist drill or indexable drill if you have to drill hole of 1 1/4" ?? Thank you for the answers

[bryanrabb]

i would use an indexable undersize it, then ream it out to make it true. But that is just what I would do

[cdlenterprises]

Indexable. To me it would be cost prohibitive to buy solid carbide. One oops and there goes about $200. With the indexable, it'll cost about $300 to get into it initially but they're typically alot tougher than solid carbide and often give better performance (ie faster metal removal rates)

[ctate2000]

How many holes? What machine? What material? What is depth? What tolerance on hole? All are very relavant to this question. I would go for the indexable for production work and HSS for small number of holes. Solid carbide for that size will cost way more than $200 and indexable will be more like $500 to start.

[broby]

A 31.75MM Solid Carbide drill would cost an absolute fortune!
In Australia, a 26.60mm carbide "delta" drill from Sandvik will cost us $477 (list price before any discount).
A 32mm 880 style indexable drill costs $710.00 (list).
It would be far more cost effective to use an indexable drill then finish to size with a boring bar or if the hole tolerance allows it, just drill to final size straight up.
like ctate2000 states, need to lots more information before a solid recommendation can be offered!
Cheers
Brian.

[dertsap]

a brazed carbide can fly thru aluminum, good on steel for odd ball sizes

steel - indexible for typical fractional dia holes , these suckers haul

1 1/4 Solid Carbide - out of the question !

[kalmah]

Originally Posted by broby A 31.75MM Solid Carbide drill would cost an absolute fortune! In Australia, a 26.60mm carbide "delta" drill from Sandvik will cost us $477 (list price before any discount). A 32mm 880 style indexable drill costs $710.00 (list). It would be far more cost effective to use an indexable drill then finish to size with a boring bar or if the hole tolerance allows it, just drill to final size straight up. like ctate2000 states, need to lots more information before a solid recommendation can be offered! Cheers Brian.

OUPS I'm sorry !! My conversion is false... The tool diameter of my drill is 12mm !!!
Can you answer to my question with a drill of 0.5 inches ??

THankx

[dertsap]

solid carbide thru spindle coolant
eg : 4140 g81 4700 rpm 50 ipm

aluminum try a carb tf drill if you really want to punch holes

let the chips fly

[MDLang]

.5 solid carbide Tungaloy drill. 4130 HT, 400 SFPM .014 feed per rev. straight through no dwell no peck up to 5 times diam.

Running right now.

Tungaloy drills put the others to shame!

Mike