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APPENDIX B

Fabrication of a Jacket Muffler

and a Damped Drill Rod

Two different sleeves were used for the drill noise abatement project.

The first sleeve, shown in figure B-1, was a seamless neoprene sleeve, bought

from Apex Equipment Inc., Seattle, Wash. Apex will provide end caps if a

template of the drill body is provided. This seamless sleeve presents a problem of removal for repair of the drill.

The second (and recommended) sleeve (fig. B-2) was made from a sheet of

1/4-inch-thick C-1002 E-A-R energy absorbing material manufactured by National

Research Corp. of Cambridge, Mass. The sheet was cut to size to create a

cylinder or sleeve of approximately 5-1/2-in ID and 15 in long, as shown in

figure B-3. The edges were fastened together by means of an extruded aluminum H cross section, the end view of which is shown in figure B-4. One edge

was drilled and pop-riveted for permanent fastening (fig. B-5), and the other

was drilled and fastened with metal self-tapping screws for easy removal.

IlIOIIU I I 4 • •

FIGURE B-1.· Jacket sleeve manufactured by Apex Equipment Inc.






38

INCHES 2. 3 .4 5 6

FIGURE 8-12. - A split end cap with tubes installed.

Installing the Jacket

and End Caps

The fe dIg, handle,

and connecting air hose were

removed. The end caps were

plac d on the drill body,

and the jacket cover was

wrapped around the drill.

The metal screws were used

to join the ends of the

cover. The drill at this

point is shown in figure B-13. Large hose clamps

were installed at each end

of the jacket as sho\Yll in

figure B-14. The fe d leg

handle and air hose were

installed in figure B-15.

Longer bolts were us d to

install the f ed leg in

order to extend the handle

of the drill out and away

from the jacket for sufficient room for handling. A

photograph of the finished

drill with the now unnecessary external muffler

attach d is shown in

figure B-16.

Figure B-17 shows a

L Roi LSC-75 stoper drill

and figure B-18 shows a

Le Roi Cl v land H23DR rackmounted sink r drill both

of which have b n modifi d

with a jack t muffl r similar to that of the d scribed

lng rsoll-Rand drill.

Drill Rod oise

Abatement

The rods used were

1 inch across the flats. 'Regardless of th rod length, th damper should be

plac d as n ar the chuck end as possibl allowing sufficient spac so that the

damper is not hit by the chuck. Six to ight inches is suffici nt length.

S amless ste 1 tubing l-3/8-inch OD by 0.049-inch wall as us d. Th lastom r or urethane used was th same as that for the nd caps--numb r 80 D vcon