On Monday 09 May 2016 09:27:26 Rick Lair wrote: > Hello Gene, > > Not sure if it was mentioned, > > Have you looked at Mcmaster Carr, I see they have M7x1 SHCS, various > lengths, > > http://www.mcmaster.com/#socket-head-cap-screws/=12c2urv > > And you could have them next day, > > Rick
Probably true, but IIRC they have a minimum order, and I am running out of time, so I made it work with some TSC bolts yesterday, and have it about 1/2 cut way thru the first cut by the time I called it beer thirty last night. Time being measured in how much longer my back will let me walk. In the process last night, I came to the conclusion I was wasting time trying to drive it straight thru as the cutting face was, in the middle of the cut, some 4" wide on the rim of the saw blade. So I stopped and wrote some code that put the blade at the rear of the cut and pushed the table to the rear by 45mm at 40mm a minute, then raised it .005mm and retraced it back the the starting point, then advanced 1mm at 1mm feed, then ran the y out and back. And I just realized that .005mm for the rise I was thinking inches, so when I restart the rest of that cut, I'll edit that up a bit as the idea is to maintain some side clearance for the blade. And in metric, .005mm isn't squat. 0.05 or even .1 would be more like it. That first move at 40mm/min, cutting a mm deeper, isn't running the motor current above 3.25 amps, and its throwing a quite visible stream of iron dust out of the slot. Some dust on the retrace, and the net speed is about 10x what I could do without the y motion to concentrate the cut on a much smaller length of blade circumference. At 400 revs, no sparks which would tell me I am burning up the diamonds, just iron dust all over. I assume that is the desirable state of affairs since the blade was $45 USD. Clearly, I need a power hacksaw. but I've no room left for one. > On 05/09/2016 09:06 AM, Dave Cole wrote: > > Gene, > > Do you have any Rural King stores around you? > > The local big Rural King is selling metric screws by the pound. > > A little ironic I think; They should probably be selling them by > > the Kilogram. ;-) > > That said; I doubt that they have 7mm screws if they are rare. But I > > know they have 6 and 8 mm screws by the lb and for about the same > > price as SAE sizes. > > > > Dave > > > > On 5/7/2016 11:49 PM, Gene Heskett wrote: > >> Greetings all; > >> > >> Trying to hold a 10" diamond saw blade yesterday, tight enough to > >> keep it from slipping, I striped out the 6mm threads in my arbor. > >> > >> So today I bored it gently out to around .230" or 15/64's and > >> re-tapped that to 7mm x1.0. It wasn't until I was cleaning that up > >> that I realized I had not seen any 7mm x1.0 screws on my side of > >> the planet. So I assume that I may as well redo it for an 8mm screw > >> tomorrow. > >> > >> But that will be loads of fun because with the 7mm tap in the > >> chuck, I had to keep asking for a smaller peck per stroke because > >> even in low gear, and the current limit in Jon's servo amp set to > >> limit at about 15 amps, 150% drive for that motors nameplate, I was > >> raising the divider that determined the additional stroke per peck > >> until it was taking at least 7 or 8 pecks to tap one additional mm > >> deeper. Combine that with the tap I was using have a longer that > >> normal nose taper, I hit the bottom of the hole and that locked the > >> spindle so I'm standing there, noting the spindle had stopped and > >> jon's servo amp was singing as it overload regulated. Stopped > >> lcnc, loosened the chuck to release the tap, ran the head up 6" or > >> so, and unscrewed the tap from the hole. Threads look great, but I > >> suspect there is not a 7mm cap screw about in these here parts. > >> Pure unobtainium comes to mind for the alloy. :) > >> > >> So, just out of curiosity, are 7mm bolts really that hard to find, > >> or am I looking in the wrong local stores? > >> > >> NAPA perhaps? Pricy there though. Seems metric in the label makes > >> them an additional $2 a bolt or nut. Been there, done that. Should > >> have gotten a free t-shirt for the price I paid for a 6 pack of 8mm > >> self lockers. Bah. > >> > >> Home Depot, up in Bridgeport, 26 miles up the Super-Pot-Hole, aka > >> I-79 has the best stock ATM, but I cannot recall seeing any 7's. > >> 8's I can probably get locally at Tractor Supply. In a decent > >> alloy even. > >> > >> I also think my 8mm tap is a lot sharper than the black oxide > >> finished 7mm is, so maybe I can get by driving it with the mill. > >> We'll find out tommorrow. > >> > >> Thanks everybody. > >> > >> Cheers, Gene Heskett > > > > -------------------------------------------------------------------- > >---------- Find and fix application performance issues faster with > > Applications Manager Applications Manager provides deep performance > > insights into multiple tiers of your business applications. It > > resolves application problems quickly and reduces your MTTR. Get > > your free trial! > > https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
