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What is hole tolerance before polishing?
Hi Guys. I need some tooling EDM sunk but need to know as a rule of thumb how much smaller the electrode needs to be than the final hole (before polishing.) for instance if the hole is to be 6mm, would I use a 5.5mm electrode, which would spark to 5.6/5.7, leaving me 0.03 to polish? I have...- Lplates
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- Replies: 3
- Forum: EDM Machining
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Stamped brass oil removal.
Hi team, Long time no post! Business is going great but once again I’m coming to my fellow PM team for some advice. We are stamping our own brass / copper parts now at a furious rate, however the stamping oil cleaning is a bit of an issue. Anyone have any advice on the best way to bulk remove... -
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Leaving dies glass hard?
Hey team. My die making, lapping and polishing is really starting to pick up and I’m really starting to make some nice parts. Lapping bores with 3 micron paste is annoying though… haha. So I did have a question to refine my process… the dies we use are 4140 or O1 - I normally harden them, then... -
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Scale thickness of EDM sinker?
Hey team. Things are Progressing well here and my die making skills are getting better every day. I’m wondering however we are trying to hit a repeatable tolerance on an EDM sunken part which is essentially a blind hole. We have to sand and lap the bore but are trying to not have to stand there...- Lplates
- Thread
- Replies: 3
- Forum: EDM Machining
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Entry Level CNC Lathe with Bar feeder.
Hey guys, hoping to get some Sub 30k suggestions on a CNC lathe with bar feed. Something has come up that would be awesome, only small parts, mostly copper and brass, don't need huge HP, smaller footprint preffered. Any thoughts where I should start? Max diameter would be 0.4". Thanks guys.- Lplates
- Thread
- Replies: 11
- Forum: CNC Machining
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Air Quenching 4140
Hey guys quick question. I have to hold some tight tolerance on some punch pins, I can pretty much only get 01, 4140 and 1045 in a pinch. I do get some warping with both oil and water quench but do leave enough to hard turn to final D without toooooo much trouble, however wondering if there was... -
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Help with new lathe ways not straight... ughgh!
Hey Guys, Recently bought a Taiwanese AL-960B- Was told it's a great lathe for the money. Purchased new. I noticed it's cutting a taper but only right near the spindle, in the last 30mm or so, and it tapers about 0.1mm over that distance. Along the bed up until then it holds dead on. On closer...- Lplates
- Thread
- Replies: 38
- Forum: Machine Reconditioning, Scraping and Inspection
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Need advice to make a die
Hi Team. So I'm trying to make my own geometry on bullet swaging dies, and have had some requests locally from other bullet makers. (For copper jacketed bullets.) However I'm finding them incredibly difficult to make. I'm using 4140 and a custom form cutter I've had made, I drill in multiple... -
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Deep drilling with thin drill bit in 4140 on Lathe
Hey Guys, As the post says, I need to drill 10 parts, with a 1.6mm drill bit, to a depth of (ideally) 10 mm. Is an ejection punch hole that meets another reamed hole on the other side. AAAaaannnddd snappy snap snap snap. Usually right at about 5-8mm. Feeds and speeds seem ok, the lathe... -
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Heat shrinking an honing.
Hi team. First post, Learner manufacturer. Sales have outstripped my knowledge... needed some advice. I have a part for a die for production parts that has to be heat treated and honed to final diameter to get the hardness up. It is a cylinder, 1 inch diameter, with a 1/4 inch bore, that has...