Tweet
Hi All;I just got a quote back for all the nuts and bolts needed to build this gyro. Was I shocked or what? Over $400..Made me wonder if there is a metric or grade equivalent for AN bolts?Norm
-
-
I have never added the full cost of bolts on my gyros but to me that seems reasonable. They do most of the work after all.PeteBairnsdale,Vic.
-
I have never added the full cost of bolts on my gyros but to me that seems reasonable. They do most of the work after all.PeteBairnsdale,Vic.
Comment
-
I have never added the full cost of bolts on my gyros but to me that seems reasonable. They do most of the work after all.PeteBairnsdale,Vic.
Comment
-
Norm,We normally use grade 5 UNF bolts where there is some redundancy, eg, more than 2-3 bolts in a connection. If you've ever tried to break one you'll find they are like v.f.strong licorice.. I tried one, bent it at 90 degrees to its axis then had to go 180 degrees in twist before it let go. Do not use grade 8 bolts as they are too brittle. As far as metric bolts are concerned you should consult a party such as AJAX fasteners for an equivalent grade to grade 5.. I believe it to be '8.8' [eight eight] bolts, not grade '8' but 8.8 which are a high strength structural steel bolt typically used in construction where high strength friction bolted connections are done.A N bolts are expensive because of the quality control scheme they have for them. I'd most likely use them on things like the teeter bolt and the like where a high quality bolt is imperitive. Have a chat with Jack Allen as he builds machines and A N bolts do not figure in a big way, I know most of his are just 1/4 UNF grade 5 and the critical ones are AN.Hope this helps,Nicholas TomlinAlarmist - www.alarmist.com.au - we scare for you
Comment
-
Norm,We normally use grade 5 UNF bolts where there is some redundancy, eg, more than 2-3 bolts in a connection. If you've ever tried to break one you'll find they are like v.f.strong licorice.. I tried one, bent it at 90 degrees to its axis then had to go 180 degrees in twist before it let go. Do not use grade 8 bolts as they are too brittle. As far as metric bolts are concerned you should consult a party such as AJAX fasteners for an equivalent grade to grade 5.. I believe it to be '8.8' [eight eight] bolts, not grade '8' but 8.8 which are a high strength structural steel bolt typically used in construction where high strength friction bolted connections are done.A N bolts are expensive because of the quality control scheme they have for them. I'd most likely use them on things like the teeter bolt and the like where a high quality bolt is imperitive. Have a chat with Jack Allen as he builds machines and A N bolts do not figure in a big way, I know most of his are just 1/4 UNF grade 5 and the critical ones are AN.Hope this helps,Nicholas TomlinAlarmist - www.alarmist.com.au - we scare for you
Comment
-
Norm,We normally use grade 5 UNF bolts where there is some redundancy, eg, more than 2-3 bolts in a connection. If you've ever tried to break one you'll find they are like v.f.strong licorice.. I tried one, bent it at 90 degrees to its axis then had to go 180 degrees in twist before it let go. Do not use grade 8 bolts as they are too brittle. As far as metric bolts are concerned you should consult a party such as AJAX fasteners for an equivalent grade to grade 5.. I believe it to be '8.8' [eight eight] bolts, not grade '8' but 8.8 which are a high strength structural steel bolt typically used in construction where high strength friction bolted connections are done.A N bolts are expensive because of the quality control scheme they have for them. I'd most likely use them on things like the teeter bolt and the like where a high quality bolt is imperitive. Have a chat with Jack Allen as he builds machines and A N bolts do not figure in a big way, I know most of his are just 1/4 UNF grade 5 and the critical ones are AN.Hope this helps,Nicholas TomlinAlarmist - www.alarmist.com.au - we scare for you
Comment
-
Um, Nick, I enter this discussion with some trepidation as I could very easily be misquoted &/or misunderstood. Regretably it seems there is no longer any guarentee that AN bolts are in fact subject to a strict testing regime as they used to be. I believe what you say about good quality Grade 5 bolts from a reputable manufacturer is correct, on the other hand, where did they get them from? ?China ? India ??? or are they locally manufactured to a high standard?Plating is another potential problem, i.e. Hydrogen embrittlement, if they are plated they must shortly after be heat treated to deal with this, so you are probably better off to use them black.But finally the main problem is where the shank ends i.e. the grip length. Under no circumstances must the threaded bit be in shear, thus a limited use of washers and careful design may allow these bolts to be used, provided your TA feels he can pass it!THIS DOES NOT MEAN YOU CAN GET OUT YOUR DIES AND CUT SOME MORE THREAD, BOLTS HAVE ROLLED THREADS, CUT THREADS ARE STRESS RAISERSJohn EvansThink logically and do things well, think laterally and do things better.
Comment
-
Um, Nick, I enter this discussion with some trepidation as I could very easily be misquoted &/or misunderstood. Regretably it seems there is no longer any guarentee that AN bolts are in fact subject to a strict testing regime as they used to be. I believe what you say about good quality Grade 5 bolts from a reputable manufacturer is correct, on the other hand, where did they get them from? ?China ? India ??? or are they locally manufactured to a high standard?Plating is another potential problem, i.e. Hydrogen embrittlement, if they are plated they must shortly after be heat treated to deal with this, so you are probably better off to use them black.But finally the main problem is where the shank ends i.e. the grip length. Under no circumstances must the threaded bit be in shear, thus a limited use of washers and careful design may allow these bolts to be used, provided your TA feels he can pass it!THIS DOES NOT MEAN YOU CAN GET OUT YOUR DIES AND CUT SOME MORE THREAD, BOLTS HAVE ROLLED THREADS, CUT THREADS ARE STRESS RAISERSJohn EvansThink logically and do things well, think laterally and do things better.
Comment
-
Um, Nick, I enter this discussion with some trepidation as I could very easily be misquoted &/or misunderstood. Regretably it seems there is no longer any guarentee that AN bolts are in fact subject to a strict testing regime as they used to be. I believe what you say about good quality Grade 5 bolts from a reputable manufacturer is correct, on the other hand, where did they get them from? ?China ? India ??? or are they locally manufactured to a high standard?Plating is another potential problem, i.e. Hydrogen embrittlement, if they are plated they must shortly after be heat treated to deal with this, so you are probably better off to use them black.But finally the main problem is where the shank ends i.e. the grip length. Under no circumstances must the threaded bit be in shear, thus a limited use of washers and careful design may allow these bolts to be used, provided your TA feels he can pass it!THIS DOES NOT MEAN YOU CAN GET OUT YOUR DIES AND CUT SOME MORE THREAD, BOLTS HAVE ROLLED THREADS, CUT THREADS ARE STRESS RAISERSJohn EvansThink logically and do things well, think laterally and do things better.
Comment
-
Excellent! Usefull response. Thanks.I've been able to get the tension and sheer rating on metric 8.8 bolts and they are the same as Grade 5 bolts. One area of concern is the conversion of bolt sizes to metric.EG. AN3 = 3/16" = 4.7625mm = M4 or M5? AN4 = 1/4" = 6.35mm = M6? AN5 = 5/16" = 7.9375mm = M8?Any thoughts on the above. My gut feel is that one should round up to the nearest metric size rather than down but metric sizes don't exactly make that easy.. For example, my understanding is that M7 is not a common metric size.From my obsessive-compulsive point of view - I like nice paterns - I'd go for M4, M6 and M8. What's your reading on this?Norm
Comment
-
Excellent! Usefull response. Thanks.I've been able to get the tension and sheer rating on metric 8.8 bolts and they are the same as Grade 5 bolts. One area of concern is the conversion of bolt sizes to metric.EG. AN3 = 3/16" = 4.7625mm = M4 or M5? AN4 = 1/4" = 6.35mm = M6? AN5 = 5/16" = 7.9375mm = M8?Any thoughts on the above. My gut feel is that one should round up to the nearest metric size rather than down but metric sizes don't exactly make that easy.. For example, my understanding is that M7 is not a common metric size.From my obsessive-compulsive point of view - I like nice paterns - I'd go for M4, M6 and M8. What's your reading on this?Norm
Comment
-
Excellent! Usefull response. Thanks.I've been able to get the tension and sheer rating on metric 8.8 bolts and they are the same as Grade 5 bolts. One area of concern is the conversion of bolt sizes to metric.EG. AN3 = 3/16" = 4.7625mm = M4 or M5? AN4 = 1/4" = 6.35mm = M6? AN5 = 5/16" = 7.9375mm = M8?Any thoughts on the above. My gut feel is that one should round up to the nearest metric size rather than down but metric sizes don't exactly make that easy.. For example, my understanding is that M7 is not a common metric size.From my obsessive-compulsive point of view - I like nice paterns - I'd go for M4, M6 and M8. What's your reading on this?Norm
Comment
-
Norm, you are on the wrong track. You wont get a TA to pass your machine if you are not using AN bolts. Go spend the money and you will save yourself a lot of trouble at the other end.PeteBairnsdale,Vic.
Comment
-
Norm, you are on the wrong track. You wont get a TA to pass your machine if you are not using AN bolts. Go spend the money and you will save yourself a lot of trouble at the other end.PeteBairnsdale,Vic.
Comment
Comment