Reaming

Standard drill presses, as well as other drilling equipment used for metals and wood, are appropriate for drilling and reaming thermoplastics. Speeds and feeds must be controlled to avoid heat build-up. 

Wood and metal drill bits can usually be used, but best results are obtained with commercially available bits designed for plastics. 

These special drills usually have one or two highly polished or chrome plated flutes, narrow lands, and large helix angles to quickly expel chips and minimize frictional heating. 

For holes in thin sections, circle cutters, or drills which only cut the circumference and eject a round thin plug of material, will often be preferred for production. 

PROCESS WATtR CONTAINER SCRAP 1 VACUUM MOLD FLLUV SJRCS Pt AS7IC 

Typical taper shank spiral flute reamer 

Combination spiral reamer with pilot drill 

Lead times varying from short to moderate. Reduced by automation. Minimum amount of material removed. 

Flexibility high. Little dedicated tooling and generally short setup times. 

Process does not normally operate within this region 

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Most rigs are now fitted with a system whereby the drill string is rotated by a drive mechanism in the mast rather than by the rotary table at rig floor level. Thus 90 foot sections can be drilled before connections need to be made, and the drill string can be rotated while pulling out of the hole in 90 foot sections. This improved system, which speeds up the operation and allows better reaming of the hole is known as top drive. 

In another extractor (Automatic Machinery and Electronics Inc. (AMC)) the individual fmits are cut in half as they pass a stationary knife. The halves are oriented in a vertical plane, picked up by synthetic mbber cups, and positioned across plastic serrated reamers revolving in a synchronized carrier in a vertical plane. As the fmit halves progress around the extractor turntable, the rotating reamers exert increasing pressure and express the juice. The oil and pulp contents in the juice increase with greater reaming pressure. The recoverable oil is removed in a separate step prior to juice extraction. Needle-sharp spikes prick the peel of the whole fmit, releasing oil that is washed away with water and recovered from the oil—water emulsion. 

TMI-2 Ressons Reamed Task Force Status Report and Short-Term Recommendations NRG Report NUREG-0578, U.S. Nuclear Regulatory Commission, Washington, D.C., July 1979. 

It is standard practice to provide a chamfer at the inside edges of tube holes in tiibe sheets to prevent cutting of the tubes and to remove burrs produced by drilling or reaming the tube sheet. In the lower tube sheet of vertical units this chamfer serves as a pocket to collect material, dirt, etc., and to serve as a corrosion center. 

Paper, kraft, wrapping quality, 50-lh/ream basis-weight yield = 3000 fr/ream 0.50... 

Ream out and polish the suction throat and pathway to the impeller. This is normally the roughest casting inside the pump. Center the suction nozzle (tn a lathe and open the diameter of the pathway toward the impeller. This lowers the existing NPSHr of your pump, reducing the Hi. 

Machine and polish the suetion throat of the pump. This is probably the worst easting, and roughest finish in the entire pump. Center the suetion flange on a lathe and ream-out the suetion throat. This reduces the Hi. 

A new nose eone was obtained and initial maehining performed by die repair faeility. The nose eone is supported by six radial pins. The nose eone and inlet easing were sent to die main plant to ensure die pin hole loeations were properly positioned. Here, die inlet easing was assembled and oversized pin holes were drilled and reamed in die pieees. Pins made to fit die holes were also maehined. Repau maehining... 

Placing the fluid through the tubes is a consideration when special alloy materials aie needed for corrosion control, because the materials would be needed only on the tubes. If the corrosive material is in the shell, both the tubes and the shell would need to be protected with special alloy. It the fluid is at high pressure, it should be put in tubes because tubes can contain high pressure much more cheaply as they are much smaller in diameter than the shell. The low-pressure fluid would be in the shell. If the fluid contains vapor and non-condensable gases, heat transfer will be greater if it is placed in the tubes. If the fluid is scale forming it should be in the tubes, which can be reamed out. 

Thti glim ream of certain speciis of Fen,la, clilufl), in all proli-ahility, J iir/A j, and Ferjila sccrcdosnni, boih perennial hetlrs. 

Folye lcr Phenolic nase ream Epoxy Melamine Polyurethane... 

Three-point bottom hole reamer. This type of reamer is usually run between the drill collars and the bit to ensure less reaming back to bottom with a new bit. 

At X380 m Drag and rotary friction increase due to the third and fourth stabilizers hanging and digging in sand at X310. ROP decreases from 50 to 10 ft/hr. Work and ream pipe, drag decreases, ROP increases to 70 ft/hr. Rotary friction does not go down until stabilizers are out of the sand. 

At X520 m Drag and rotary friction increase as the third stabilizer enters sand at X480. ROP decreases from 80 to 15 ft/hr. W ork and ream pipe with no success. Five-stand wiper trip. Drag and rotary friction decrease to normal levels, ROP increases to 50 ft/hr. 

At X150 m Connection, work and ream pipe. Stabilizers now out of sandy sections. Rotary friction factor decreases. 

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