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Recent content by rabtrfld
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Carburizing box
Of all the dirty, low-down, conniving schemes, I like yours best :D! (I have read that there are 200 plus opinions about those reactions, too!) -
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Carburizing box
Just to improve toughness of machine parts - don't care color. -
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Carburizing box
I bought pack-carburizing compount (Rose Mill WILCARBO) but I don't know what to use for a box. Most articles suggest sealing the "box" with fire clay etc. so it needs to be airtight (but "leave a vent hole"). I could weld a box, but it would seal badly. Or I could make a pipe bomb with some... -
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Case hard depth using EDM
Normally our HT provider measures case depth & gives us a nicely polished sample. But we wanted to check something in-house, so we gave it a try. First the part was cut off with EDM, then surface-ground on an old Chevalier. After dunking for various times in 5% nital, nothing showed up. I was... -
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Novel method to chase hard threads
Y'know... got some valve grinding stuff right here, I'll give it a try, :scratchchin:thanks for the idea -
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Novel method to chase hard threads
Sorry, I know there are a million "threads" about tapping, but here goes. We made some (50) fixtures out of S7 and had them hardened. Unfortunately an internal thread was CNC single-pointed (not my call) and they are too tight now. They are 1/2-20 but only used for setscrews that retain some... -
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Lucifer furnace firebrick repair
I understand one doesn't open a ceramic kiln until it has cooled? Our stuff heat treats under 1800F, so it's no big deal to open the door and rake it out. But a friend from high school became a glassblower, in apprenticeship he was exposed to fused quartz over 2500F and said it was something to... -
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Lucifer furnace firebrick repair
Old Lucy here has some serious leaks around the door. There are so many firebrick repair products out there, I don't know where to start. It is so crumbly, it would be easy to make it worse. Any experience? This is a 2000F heat treat furnace, so no fireplace goop allowed. Even ceramic kiln... -
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Threading insert IR vs. EL, or ER vs IL, NR, NL etc.
Found the page, Carmex thread turning technical section. Here's the link. http://www.carmexusa.com/contentonly.aspx?file=pdf/2019_Inch/065-074_thread_turning_technical.pdf Haven't read it yet, but it is the best reference I've seen so far. Thanks, sfriedberg, I will "like" your post & call it... -
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Threading insert IR vs. EL, or ER vs IL, NR, NL etc.
Well... thanks, I have that chart, & several others, but it doesn't tell me anything. It doesn't show the difference in geometry between IR and EL, which look exactly the same in plan view. It doesn't help that I don't know the exact geometry of the proposed toolholders, I'd really like to see... -
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Threading insert IR vs. EL, or ER vs IL, NR, NL etc.
Guys, I'm sorry to flog this subject, I know there are 1500 posts about threading but I have been searching & reading on-line for WEEKS and still haven't found what I need to know. This is for maintenance and R&D, not production, and I buy my own tools so I'll be using the cheap stuff on Ebay... -
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Precision Measuring Tool- 4 Jaw Universal Chuck
Molding compound, Repro Rubber, Silastic 3110, I've heard dental wax suggested. We used to use 3110 until we bought a Micro-Vu Vertex with probes. For this I wouldn't even use the probes, just Z-axis optical scans & construct theo corners. Dow 3110 is pourable & takes about 15 minutes to cure... -
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Hardness testing advice?
I always avoided hardness files because I wouldn't know when they are worn out. But I have used a generic file to check. Our drawing says HRC but I only want to check yes/no to see if our supplier skipped a process - which has happened. In this case I have caught errors using a file. Bought... -
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Hardness testing advice?
I have an Ames in a stand right here on my desk. Works as well as Wilson minus one decimal place. Mine only goes up to R45N but that converts nicely to HRC. Highly recommended. The only fiddling is when that little pin gets on the wrong side of the finger - you probably know what I mean... -
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Hardness testing advice?
Thank you ! I would vote this up but don't think this forum has that crap (thankfully!) I was scared of Leeb after bad experience with ultrasonic. Starting to come around. Didn't know about the grease-on-anvil trick, anvil alone is not magic. I'll try that. Reminds me of that blue ketchup...