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PEARL, INC.
- FACILITY TOUR |
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12", 20 Speed Delta Wood Lathe c/w Delta Compound Slide Rest |
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Rockwell 8" Jointer |
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We sent the machine to Dominion Bridge, here in Calgary, who at that time had a huge Snow, surface grinder capable
of working a 36" x 72" surface. What we now have is a very accurate machine. Although not evident from the photo, the cutter knives are "back ground" to reduce the effective rake angle with respect to the work surface. It's not generally realized that most jointer and thickness planer cutter heads are machined so as to provide a rake angle optimized for working soft woods. |
When such a steep angle is used with hardwoods, "tearout" is a common effect, notable and problematic
with burls. curly, crotch and "birds' eye" grains. When back ground to reduce the rake angle from 30
to 20 deg. such problems are practically eliminated and cutter life is greatly extended due the cutting edge being
better self-supported. Any discussion of cutting tools would not, on this site at least, be complete without mention of the life-extending benefits of cryo-treatment. While not common knowledge amoung audio folk, such benefit has been known in the metalworking industries for some time . . . |
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Rockwell 17" Drill Press |
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Fig. 3. Here's a 17" Rockwell drill press bought new in the early '70s and rebuilt in '00. Although it has seen a lot of hard use the machine has stood up well, the only problem having been a poorly designed motor-mounting bracket that allowed the motor some real latitude of motion. This repaired, the machine runs beautifully. |
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A Classic Holbrook C10 - 12" x 20" Toolroom Lathe; Construction No. 10573 - Built 1964, acquired in 1982 |
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Another Classic Holbrook C10 - 12" x 20" Toolroom Lathe; Construction No. 10599 - Built 1964, acquired in 2014 |
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TEKTRONIX Type 570 Electron Tube Characteristic-Curve Tracer — Eight units we've owned |
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Fig. 6. A few pages on the last of eight Tektronix
Type 570 Electron Tube Characteristic-curve Tracers I've have owned. Type 570 serial numbers started at 100 and finished around 005700. Amoung others not documented that went directly to such David Manley of VTL, Ei in Yugoslovia, Roger Modjeski and Hong Kong Bush, I've owned ser. nos. 215, 005189, 005372 as well as the one seen here, 005580, sold on eBay around 2000 and shipped to Japan. |
The other three were sold on eBay as well. There is some duplication in the pix from one sale to the next because,
with the exception of ser. no. 215, the rest were so close to identical that all new pix were pointless. All are in the hands of their respective owners and in the approxitamely 30 year span since we started selling these we've not heard one complaint of failure. See this page on jacmusic.com regarding the demise of the Ei factory, scroll well down to see what happened to Type 570 ser. no 005548. |
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Rheometry & Dynamic Mechanical Analysis (DMA) — The Measurement of Polymeric Materials' Characteristics |
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