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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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master cylinder finish
What is the usual finish for hydraulic master cylinders internal bores.
Say a brake master cylinder. Would reaming be good enough? Material is 303 cheers T.Alan |
#2
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master cylinder finish
T.Alan Kraus wrote:
What is the usual finish for hydraulic master cylinders internal bores. Say a brake master cylinder. Would reaming be good enough? Material is 303 Considering a brake hone uses stones of about 320 grit, I expect reaming would be OK |
#3
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master cylinder finish
On Mar 6, 10:03 am, "T.Alan Kraus" wrote:
What is the usual finish for hydraulic master cylinders internal bores. Say a brake master cylinder. Would reaming be good enough? Material is 303 cheers T.Alan Usually they are honed with a Sunnen hone. Usually the point is to remove any striations or rings (lines going either along the length of the cylinder or around the bore). |
#4
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master cylinder finish
woodworker88 wrote:
On Mar 6, 10:03 am, "T.Alan Kraus" wrote: What is the usual finish for hydraulic master cylinders internal bores. Say a brake master cylinder. Would reaming be good enough? Material is 303 cheers T.Alan Usually they are honed with a Sunnen hone. Usually the point is to remove any striations or rings (lines going either along the length of the cylinder or around the bore). Well, yes, but a certain fine finish is desirable, and a mirror finish is not. |
#5
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master cylinder finish
Rex wrote:
woodworker88 wrote: On Mar 6, 10:03 am, "T.Alan Kraus" wrote: What is the usual finish for hydraulic master cylinders internal bores. Say a brake master cylinder. Would reaming be good enough? Material is 303 cheers T.Alan Usually they are honed with a Sunnen hone. Usually the point is to remove any striations or rings (lines going either along the length of the cylinder or around the bore). Well, yes, but a certain fine finish is desirable, and a mirror finish is not. Yes I researched that and found out that there are two issues at play. One is the obvious piston seal deterioration by friction with a rough bore surface, the other is an increased stiction for the o ring seal when the bore surface is too smooth. These two issues work against each other and there is a happy medium. Somewhere I saw the figure of 20 micro inches or an Ra of 5. Can anyone confirm or shoot this down? cheers T.Alan |
#6
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master cylinder finish
T.Alan Kraus wrote:
Rex wrote: woodworker88 wrote: On Mar 6, 10:03 am, "T.Alan Kraus" wrote: What is the usual finish for hydraulic master cylinders internal bores. Say a brake master cylinder. Would reaming be good enough? Material is 303 cheers T.Alan Usually they are honed with a Sunnen hone. Usually the point is to remove any striations or rings (lines going either along the length of the cylinder or around the bore). Well, yes, but a certain fine finish is desirable, and a mirror finish is not. Yes I researched that and found out that there are two issues at play. One is the obvious piston seal deterioration by friction with a rough bore surface, the other is an increased stiction for the o ring seal when the bore surface is too smooth. These two issues work against each other and there is a happy medium. Somewhere I saw the figure of 20 micro inches or an Ra of 5. Can anyone confirm or shoot this down? I wrote Raybestos tech dept, awaiting answer |
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