Eccentric Reamer System Step-by-step

1.When drilling starts,the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly.
2.When the required depth is reached,rotation is reversed carefully,whereupon the reamer swings in,allowing the drill bit assembly to be pulled up through the casing.
3.Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent.
4.Drilling continues to the desired depth in the bedrock using a conventional drill tools .

	NO.	PART NAME	PARAMETER
	1	Casing Tube	Max. O.D   Min. O.D
	2	Drill Pipe	Connection Thread O.D Wrench Flats
	3	Guide Sleeve	Effctive length
	4	Dth-Hammer
	5	Casing Shoe	L3 L4 D3 D4
	6	Guide Device	L1 L2 D1 D2
	7	Reamer	D5 L5 Reaming Diameter Reamer buttons
	8	Pilot Bit	D6 L6 Gauge botton Face button

Model		90	115	140	165	190	240
Casing Tube	Max. O.D (mm)	115	142	171	195	222	273
	Min. O.D (mm)	102	128	155.6	182.6	205	260.4
Drill Pipe	Connection Thread	API 23/8 Reg			API 31/2 Reg
	O.D (mm)	76		89	114
	Wrench Flats	65			95
Guide Sleeve	Effctive length	225				250	317
DTH-Hammer		HD35	HD45	HD55	HD65		HD85
Casing Shoe	L3 (mm)	80	76	90	95	110	111
	L4 (mm)	55	50	63	65	72	75
	D3 (mm)	101.7	127	155.3	180	204.7	208.3
	D4 (mm)	93	116	141	168	193	242
Guide Device	L1 (mm)	38	48	55	61.5	62.8	70
	L2 (mm)	138	136	160	181.5	185	190
	D1 (mm)	92	115	140	166	191	240
	D2 (mm)	100	126	153.6	179.6	203	257
Reamer	D5 (mm)	91	114	138	165	190	240
	L5 (mm)	70	89	70	80	90	100
	Reaming Diameter (mm)	123	152	185	211	237	308
	Reamer Buttions	4×Φ12	5×Φ14	7×Φ14	7×Φ14	7×Φ16	16×Φ16
Pilot Bit	D6 (mm)	90	114	138	165.8	190	240
	L6 (mm)	59	67	66	82.5	82	89.4
	Gauge button	8×Φ12	8×Φ14	8×Φ16	8×Φ16	9×Φ18	12×Φ18
	Face button	5×Φ10	6×Φ12	8×Φ14	8×Φ16	9×Φ16	32×Φ16