{"id":1062,"date":"2014-05-18T08:57:03","date_gmt":"2014-05-18T15:57:03","guid":{"rendered":"http:\/\/www.rbdinstruments.com\/blog\/?p=1062"},"modified":"2021-07-22T10:17:26","modified_gmt":"2021-07-22T17:17:26","slug":"bristol-set-screws","status":"publish","type":"post","link":"https:\/\/www.rbdinstruments.com\/blog\/bristol-set-screws\/","title":{"rendered":"Bristol wrenches"},"content":{"rendered":"
\"bristol-set-screw\"

Most of the set screws used on older PHI optics are the Bristol set screw type. The main advantage to this drive system is that almost all of the turning force is applied at right angles to the fastener spline face, which reduces the possibility of stripping the fastener. For this reason Bristol set screw are often used in softer, non-ferrous metals. Compared to an Allen drive, Bristol set screws are less likely to strip for the same amount of torque. Bristol set screws come with 4 flutes on the smaller sizes and 6 flutes on larger sizes.<\/p>\n

When working on optics such as ion sources, analyzers, specimen stages and so on it is not uncommon to strip the set screws when removing them. A trick that can help prevent striping is to use a small amount of isopropanol as a lubricant before removing the set screws.<\/p>\n

Some sources for replacement Bristol set screws are –<\/p>\n

Fasteners & Metal Products Corporation<\/a><\/p>\n

Cam-Tech Industries<\/a><\/p>\n

Radax Industries<\/a><\/p>\n

Note that these set screws are not cleaned for UHV and so you will need to run them through a cleaning process before using them for UHV optics applications.<\/p>\n

\"bristol-wrench\"

When using Bristol set screws you need to use Bristol spline drivers. A source for Bristol spline drivers is –<\/p>\n

Bristol Wrench Company, Inc\u00a0 4 Hershey Drive, Ansonia, CT\u00a0 06401<\/p>\n

http:\/\/www.bristolwrench.com\/<\/a><\/p>\n

Note that Bristol Wrench no longer sells individual spline wrenches, only in sets of 10.\u00a0 Good news is that you can get individual Bristol spline wrenches from McMaster Carr –<\/p>\n

https:\/\/www.mcmaster.com\/bristol-splines\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Most of the set screws used on older PHI optics are the Bristol set screw type. The main advantage to this drive system is that almost all of the turning force is applied at right angles to the fastener spline … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1063,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[164],"tags":[137,138],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2014\/05\/bristol-set-screw.jpg?fit=156%2C156&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p2DEXo-h8","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":130,"url":"https:\/\/www.rbdinstruments.com\/blog\/phi-x-ray-source-filament-replacement\/","url_meta":{"origin":1062,"position":0},"title":"Removing the filaments in a PHI 04-548 X-ray Source","author":"Randy","date":"September 25, 2012","format":false,"excerpt":"This is part 1 of 2 - how to completely disassemble the PHI 04-548 X-ray source that has the new style filaments. Part 2 will be how to put it back together with new parts. Here is a link to a video that shows the procedure step by step. New\u2026","rel":"","context":"In "X-ray Sources"","block_context":{"text":"X-ray Sources","link":"https:\/\/www.rbdinstruments.com\/blog\/category\/x-ray-sources\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3901,"url":"https:\/\/www.rbdinstruments.com\/blog\/replacing-the-stage-brakes-on-a-15-630-specimen-stage\/","url_meta":{"origin":1062,"position":1},"title":"Replacing the stage brakes on a 15-630 Specimen stage","author":"Randy","date":"November 21, 2023","format":false,"excerpt":"This blog post describes how to replace the micrometer brakes on a PHI 15-630 specimen stage.","rel":"","context":"In "General Optics and Vacuum"","block_context":{"text":"General Optics and Vacuum","link":"https:\/\/www.rbdinstruments.com\/blog\/category\/general-optics-and-vacuum\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2023\/11\/remove.jpg?fit=1008%2C756&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2023\/11\/remove.jpg?fit=1008%2C756&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2023\/11\/remove.jpg?fit=1008%2C756&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":1349,"url":"https:\/\/www.rbdinstruments.com\/blog\/25-110-analyzer-filament\/","url_meta":{"origin":1062,"position":2},"title":"25-110 Analyzer Filament","author":"Randy","date":"February 11, 2015","format":false,"excerpt":"This is an old tech tip that I wrote back in 2002. 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The ring\u2026","rel":"","context":"In "General Optics and Vacuum"","block_context":{"text":"General Optics and Vacuum","link":"https:\/\/www.rbdinstruments.com\/blog\/category\/general-optics-and-vacuum\/"},"img":{"alt_text":"phi-660-scanning-auger","src":"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2015\/08\/SAM660.jpg?fit=1200%2C900&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2015\/08\/SAM660.jpg?fit=1200%2C900&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2015\/08\/SAM660.jpg?fit=1200%2C900&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.rbdinstruments.com\/blog\/wp-content\/uploads\/2015\/08\/SAM660.jpg?fit=1200%2C900&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":1521,"url":"https:\/\/www.rbdinstruments.com\/blog\/esca-analyzer-filament-procedure\/","url_meta":{"origin":1062,"position":4},"title":"ESCA Analyzer Filament Procedure","author":"Randy","date":"June 19, 2015","format":false,"excerpt":"ESCA Analyzer Filament Replacement\u00a0 Procedure This procedure details the step by step process to replace the tungsten filament in a PHI 25-250, 260 or 270 ESCA analyzer used on the older PHI 550, 560 and 570 ESCA systems. 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