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Buyer beware warning
I own a number of Japanese made Wohlhaupter design boring heads (bought locally in Japan.) They were made by several manufacturers, I have Kuroda Precision units. If you are looking for a unit with a native Morse Taper 4, then they will typically be labeled UFB-4 or UFB-4S, and will be clearly... -
Japanese finds
I've got a lot more, even though I've been making a real attempt to stop buying things (especially multiples.) In this thread I'm trying to show a variety of items and hopefully really unique or regional stuff. I think when the Japanese decide to do something well, they are as good as it gets...- Bakafish
- Post #32
- Forum: Machinery Photos
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Measured Thermal Expansion of a 1.25" dia by 10" long Steel Bar in Response to Bare Hand Contact
Looks like a valid test setup to get the jist of this effect, and quite plausible results. That casting came out really nice, I'm impressed.- Bakafish
- Post #62
- Forum: Machine Reconditioning, Scraping and Inspection
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Proper bearings for a mill spindle rebuild?
Even with your cherry picked partial quotes I was nodding my head in agreement with them. The attitude is that everyone here has been through this all before, a guy with a lot to learn, barging in full of piss and vinegar with big ideas demanding answers. Ideas that are neither novel nor... -
Proper bearings for a mill spindle rebuild?
Info that is publicly documented everywhere? Seems to me seeing how this thread has progressed you came seeking attention more than anything. I look through the responses and see helpful, well reasoned advice from experienced people. You seem to see something different. At this point you have... -
Proper bearings for a mill spindle rebuild?
You're going to strawman people trying to help you? Very cool. -
Proper bearings for a mill spindle rebuild?
No idea how you took "Identify the current bearings as they may be a better quality than you realize, changing their spec is unlikely to result in any improvement" to us throwing down the gauntlet as to your abilities to overcome the well documented complexity of spindle design. Rebuilding a... -
Proper bearings for a mill spindle rebuild?
I agree, but precision bearings are a 'low hanging fruit' trap for beginners. They seem like a modular thing that can be swapped out to improve performance, but are in reality so dependant on the other parts of the system that they likely will provide little value without radical changes to... -
Proper bearings for a mill spindle rebuild?
Materials and precision. Testing and validation after all the complex manufacturing costs a lot of money because of the time and equipment required to ensure it is accurate. The best manufacturers have very extensive testing regimes with the bearings properly loaded and lubricated to ensure they... -
Proper bearings for a mill spindle rebuild?
I don't claim to be an expert, but know enough about bearings that I'd advise you to replace the bearings that are there with the same exact type that the machine was designed for. The first step is identifying what's actually in there. Even if it is just using deep groove ball bearings, if they... -
Biax replacement Stroke Adjustment Screw
Finding someone with a spare bolt is really a long shot, so you should be preparing yourself to make one. Metric Acme style threads are typically called Trapezoidal "Tr" threads and you should be able to get a die to cut your own. I've seen people modify standard metric threads of the same pitch...- Bakafish
- Post #2
- Forum: Machine Reconditioning, Scraping and Inspection
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Bench grinder mounted diamond blade sharpener
I used a single pin with a matching hole drilled in the disks, but it likely wasn't required and you can always add it later if you notice it slipping.- Bakafish
- Post #3
- Forum: Machine Reconditioning, Scraping and Inspection
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Japanese finds
I think we all face a situation where we already have a tool, but a great value presents itself and we end up with more of something than we could ever practically need. But between too good to be true bargains and the need to rescue neglected tools my hoard just keeps growing. This set of brand...- Bakafish
- Post #28
- Forum: Machinery Photos
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Has anyone built an LVDT amplifier/signal conditioner?
You didn't do anything wrong, just that the OP is some kind of performative troll. Everything he proposes, no matter how difficult or farfetched, he trivializes as easy, he name drops everything he can (the gratuitous itemization of his bench gear for example), he never provides the pictures... -
knife grinder STEEL way groove repair, scrape?
Another thought, although I could be wrong, but it looks like the grinding wheel is fixed perpendicular to the rails and only moves up and down (Z?) and across the length of the blade (X?). This would mean any side to side non-linearity by the side guides wouldn't seem to affect the grinding...- Bakafish
- Post #16
- Forum: Machine Reconditioning, Scraping and Inspection
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knife grinder STEEL way groove repair, scrape?
Well first step is getting a good scope of the issue. Try to get those strips off and clean the slots and get some measurements or good observations of the damage. The machine Richard described sounds very similar to what you have, and the repair sounds practical with proper tools and planning...- Bakafish
- Post #13
- Forum: Machine Reconditioning, Scraping and Inspection
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knife grinder STEEL way groove repair, scrape?
@hvnlymachining Richard's repair advice above seems excellent, his judge of character I have a bit more of an issue with :-) He somehow got it in his head that I'm some past troll of his, kind of a disappointing "never meet your heros" sort of experience, but hope you get the issue solved.- Bakafish
- Post #10
- Forum: Machine Reconditioning, Scraping and Inspection
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knife grinder STEEL way groove repair, scrape?
From the pictures it looks like the main grinding head is located by two parallel box rails, the left one has one or two contact surfaces and the right one appears to have three to provide full constraint. The actual surfaces are removable (!) hardened steel inserts, and the issue the customer...- Bakafish
- Post #5
- Forum: Machine Reconditioning, Scraping and Inspection
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Scraping cast steel?
The downtime requirement is what scares me. I would machine a flat surface on a non-reference area and attempt scraping there before touching the real bearing surface. That way if you end up gouging the crap out of it (which is what happens with most steels from what I've heard) you can move to...- Bakafish
- Post #17
- Forum: Machine Reconditioning, Scraping and Inspection
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Measured Thermal Expansion of a 1.25" dia by 10" long Steel Bar in Response to Bare Hand Contact
I hear what you are saying and agree on unnecessary overdesign or overspecification, but the points I was trying to make were: When you can easily insulate the gripping surface of such a tool, it seems like cheap insurance to do so. Even if the movement is tiny, it could still potentially have...- Bakafish
- Post #40
- Forum: Machine Reconditioning, Scraping and Inspection