Drill Bit Speed

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Drill Bit Speed

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In general when operating a drill at a speed anywhere within its range for the particular material involved, increases in speed result in fewer holes before regrinding becomes necessary, and reduction in speed, more holes before the tool is dulled.

The most economical speed for operating a drill will depend on may variables, some of which are:
1. Composition and hardness of material.
2. Depth of hole
3. Efficiency of cutting fluid
4. Type and condition of drilling machine
5. Difficulty of set-up

Recommended speeds are shown in the flowing table. On most operations, it is usually better to start with a slower speed and build up to the maximum after trials indicate the job can be run faster.

Drill Bit Speed

(Sizes are in Inches and speeds are in RPM)

Size	Wood	Plastic	Aluminum	Brass/Bronze	Steel-Mild	Iron-Cast(soft)	Stainless Steel
1/16	16800 to 21280	5600 to 11200	11200 to 14000	8400 to 14000	4480 to 5320	4200 to 5600	1680 to 3640
3/32	11200 to 14187	3733 to 7467	7467 to 9333	5600 to 9333	2987 to 3547	2800 to 3733	1120 to 2427
1/8	8400 to 10640	2800 to 5600	5600 to 7000	4200 to 7000	2240 to 2660	2100 to 2800	840 to 1820
5/32	6720 to 8512	2240 to 4480	4480 to 5600	3360 to 5600	1792 to 2128	1680 to 2240	672 to 1456
3/16	5600 to 7093	1867 to 3733	3733 to 4667	2800 to 4667	1493 to 1773	1400 to 1867	560 to 1213
7/32	4800 to 6080	1600 to 3200	3200 to 4000	2400 to 4000	1280 to 1520	1200 to 1600	480 to 1040
1/4	4200 to 5320	1400 to 2800	2800 to 3500	2100 to 3500	1120 to 1330	1050 to 1400	420 to 910
9/32	3733 to 4729	1244 to 2489	2489 to 3111	1867 to 3111	996 to 1182	933 to 1244	373 to 809
5/16	3360 to 4256	1120 to 2240	2240 to 2800	1680 to 2800	896 to 1064	840 to 1120	336 to 728
11/32	3055 to 3869	1018 to 2036	2036 to 2545	1527 to 2545	815 to 967	764 to 1018	305 to 662
3/8	2800 to 3547	933 to 1867	1867 to 2333	1400 to 2333	747 to 887	700 to 933	280 to 607
13/32	2585 to 3274	862 to 1723	1723 to 2154	1292 to 2154	689 to 818	646 to 862	258 to 560
7/16	2400 to 3040	800 to 1600	1600 to 2000	1200 to 2000	640 to 760	600 to 800	240 to 520
15/32	2240 to 2837	747 to 1493	1493 to 1867	1120 to 1867	597 to 709	560 to 747	224 to 485
1/2	2100 to 2660	700 to 1400	1400 to 1750	1050 to 1750	560 to 665	525 to 700	210 to 455
9/16	1867 to 2364	622 to 1244	1244 to 1556	933 to 1556	498 to 591	467 to 622	187 to 404
5/8	1680 to 2128	560 to 1120	1120 to 1400	840 to 1400	448 to 532	420 to 560	168 to 364
11/16	1527 to 1935	509 to 1018	1018 to 1273	764 to 1273	407 to 484	382 to 509	153 to 331
3/4	1400 to 1773	467 to 933	933 to 1167	700 to 1167	373 to 443	350 to 467	140 to 303
13/16	1292 to 1637	431 to 862	862 to 1077	646 to 1077	345 to 409	323 to 431	129 to 280
7/8	1200 to 1520	400 to 800	800 to 1000	600 to 1000	320 to 380	300 to 400	120 to 260
15/16	1120 to 1419	373 to 747	747 to 933	560 to 933	299 to 355	280 to 373	112 to 243
1"	1050 to 1330	350 to 700	700 to 875	525 to 875	280 to 333	263 to 350	105 to 228
1-1/8	933 to 1182	311 to 622	622 to 778	467 to 778	249 to 296	233 to 311	93 to 202
1-1/4	840 to 1064	280 to 560	560 to 700	420 to 700	224 to 266	210 to 280	84 to 182
1-3/8	764 to 967	255 to 509	509 to 636	382 to 636	204 to 242	191 to 255	76 to 165
1-1/2	700 to 887	233 to 467	467 to 583	350 to 583	187 to 222	175 to 233	70 to 152

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