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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
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
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.
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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Hardness testing advice?
Sorry for the world's dullest topic... Have to certify hardness on a casting that won't fit on a Rockwell tester. Weighs about 10 lbs. Only induction treated on one small appendage. I can cut off the treated part, but have to use a hand grinder without coolant, so the hunk might get hot. OK... -
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Metric vs Imperial: Who Would Win ?
If you had a 1/2-inch boring bar and a 12 mm boring head, would you * Turn the bar down to 12 mm? * Drill the head out to 1/2 inch? * Be more careful next time you bought stuff? I'm in USA but Hate Imperial. If I accidentally leave my caliper overnight in Imperial mode, next morning I... -
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Flatting Cycle G77, HAAS to Miyano
We would like to use an old program from a Haas lathe, but it calls flatting cycle G77. We got rid of the Haas & now have a Miyano BNE51SY5 (Fanuc). We were wondering if there is a way to code around G77 not implemented on Miyano. We can surely code a flat by hand if we have to. I don't know...- rabtrfld
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- Replies: 3
- Forum: CNC Machining
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Deep drilling 1/8 inch
Sorry for flogging a tired horse - I did read some other threads about deep drilling, but still not confident. I need to make a punch/die for a pattern of holes a little over 1/8 inch. Just to punch a few hundred prototypes. I will finish the holes with number drills to get the exact diameter... -
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Internal thread as sort of a knurl
We have a chronic problem with pressing an axle into a wheel hub. It goes in with clearance, then gets hydraulically pressed to swell and lock the pin. But such is the tolerance, that the clearance varies by 5:1. The combination of small pin with large hole doesn't always lock. And... -
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Enlarging holes in cast 8620
A couple of thousand undersized holes in cast & hardened 8620... about RC 58 Holes are supposed to be 0.390 +- 0.005 in., came in at about 0.380 in. So we need to increase .380 to at least .385 dia. about an inch through. I would rather put the parts in a vise and use a hand drill, than try to... -
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Parts Washer Disinfectant
Any ideas of a good disinfectant for parts cleaning tanks? We have one solvent based tank and one alkaline aqueous tank (with an orange smell). They both smell like sewage. And it isn't just going away with the hot weather, like a miracle. I poured about a pint of benzalkonium chloride from... -
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Multipress out of business?
Multipress (formerly Denison) hasn't returned an email for years, and now all their contact addresses are undeliverable. Anybody heard rumors of their demise? -
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Bearing shields ZZ tightness
You all know what a "shielded" bearing is, type Z or ZZ... Well, our mgmt has decided that shields must be ABSOLUTELY incapable of any rotation. We buy 100s of thousands of bearings from another vendor and re-ship them to our customers or build them into assemblies. We have a guy with a little... -
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How to check sprocket hardness
A customer just returned many tons of product because we did not provide a hardness certification for a small sprocket. (Nor did they ask for one until after they received the shipment.) The part is a stock sprocket #41-24T made in Taiwan and nobody here thought to check it. It was ordered as... -
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Big screw broke off inside - Help extract!
:eek: A 3-inch hydraulic rod has a 7/8-9 screw broken off about 1/2 inch inside ! :eek: The screw is some really hardened tool steel. They managed to grind a slot in the end of the screw with a die grinder, but our little impact driver was not able to budge it. BTW, the screw was hard bottomed... -
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Reverse threading blind hole
Threading question... I need one piece of a threaded blind hole, with as little wasted space as possible at the bottom of the hole. Don't want to turn forwards, doing multiple passes I will surely crash on the bottom of the hole. If I turn the threading bar over and cut the back side in... -
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Mits DWC90C Err70 "EP Condition" (Electric Power)
We moved a DWC90C WEDM, and now it gives Error 70, "EP Condition" which means Electric Power. Voltage was 208 before & after the move. Actual voltage is 209 - 210 on all 3 phases (really good balance since we are 50ft from main distribution panel) Arrow on water pump indicates correct rotation...- rabtrfld
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- Replies: 2
- Forum: CNC Machining
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BSPP really hard to tap!
I needed a peak-reading pressure gage, so I bought an electronic one from Hong Kong, and it's really nice but has 1/4 BSPP thread! After looking at prices on BSPP-to-NPT adapters (rated 6000PSI), I decided it would be more "elegant" to just get the BSPP tap. Trouble is, all available taps are... -
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Old plant housecleaning, sell-off
We are re-arranging our plant (in Oconomowoc, SE Wisconsin) and getting rid of some junk. Real junk. There might be a few useful machines, but mostly parts. Motors, cylinders, indexers, stanchions, etc. There is an old BP, Chevalier grinder, and some cool stuff in the tool room that I can't...