Grinding 15X FASTER using Creep Feed | DEEP CUTS on the BLOHM from United Grinding
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- Опубликовано: 16 сен 2024
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I was a quality control inspector approximately 35 years ago in a high precision machine shop. They had a creep feed grinder that was used to cut parts for commercial sewing machines. Don’t know exactly what happened but the spindle came to an abrupt stop and the spindle nut unwound itself and the grinding wheel made its way down about 500 foot aisle way before it tried to climb a wall. One of the highlights of my machine shop career!
I first saw creep grinding years ago. Coming from a toolroom where we did lots of form grinding back in the day before wire erosion became a big thing it just goes against everything I was taught as an apprentice. Amazing how things have moved on in the last 50 years.
Yes and especially the use of an air hose on a surface grinder.
I talked my programmer into letting me set our 5 axis Okuma VTL up with a grind wheel in the live tooling. I headed the project, and 3 years later we still use the same technique. Cnc grinding is 10x faster on setup and run time.
I worked for a Machine Tool rebuild company back in the early 2000s. They developed what they called "cool cut" technology that was retrofitted to a standard surface grinder. The spindle had amp draw feedback on it and the X axis was controlled by a servo and ballscrew. Technically it was creep feed but they had a patent on this back then. It would go right through solid carbide like butter. We used CBN and diamond wheels depending what was being ground. They did end up going bankrupt around 2003 so cool cut died with the company.
I've used the approach with brittle materials many times. It's essentially HSM for grinding. Yes, coolant velocity should be at minimum 70% surface speed and use an air scrape when possible.
I think you could've improved the RA a little with a couple of quick stepover spark out passes. For a one off I would probably creep to rough then make a couple traditional finish passes. Gotta love this stuff.
100%
Would be awesome if you could convert the imperial surface roughness measurements into metric aswell!
Honestly this is the first time seeing a surface grinder taking a grind like that!
What type of work requires a grinder like this? Maybe some non flat shapes ? 3d surfaces maybe?
Creep feed grinding is typically used for profile grinding, i.e. using a profiled grinding wheel to grind integrate shapes such as the tooth profile on steering racks, tooth racks, deep slots on vane pump rotors.
We noticed you are using Cool-Grind coolant nozzles. Our Hypo-Grind flex nozzle system is the perfect match for creep-feed grinding machines.
I love surface grinders but I had no idea there were CNC versions that could cut like this, that's incredible. I was taught old school and only ever took a half thou to one thou per pass and cutting slowly was a taboo, since the material can grow up into the wheel from thermal expansion or so I was told (I never tried it to find out, the thought of one of those wheels letting loose in my face prevented that haha). But as nice as the machines I have run were with auto feed functions and such, they weren't high dollar CNC rigs with ball screws and servo drives, they were not as rigid and controllable as the new stuff. It's amazing how far machine tools have come, the idea of a CNC surface grinder just makes me want to giggle lol.
Pretty sure creep feed grinding was developed back in the 40s or 50s in Germany.
Creep feed grinders use Diamond rolls to profile the wheel for form grinding. We have 4 Blohm Profimats. We grind industrial knives with them, at 60HRC. Our machines have 2 sets of doors and magnets, so the operator can load/unload while the machine is grinding the other magnet.
It's pretty interesting. I wasn't familiar with that; we really don't have an application that would need that. I'm a centerless grinder, a between center type grinder, and I can do ID and OD in one work holding. I have not seen this. Thanks for sharing.
Jessie, king of grinding! Great video, bro!
That is some serious material removal; I had heard of surface grinding in the past, but it was only last year that I actually understood what it was, and now I need one 🙂
I spent a lot of years grinding in UK factories and always upset the other workers because I ran the machines hard and did the jobs quick.
watching from Brazil 🇧🇷 🇺🇲 👍🏽
Gotta be careful starting on the left and climb grinding. If the part comes loose it will get sucked between the wheel and vise most likely destroying both along with the machine when it shoots out the back of the wheel at terminal velocity.
So I’m sure you guys have learned a lot about grinding since filming this video; that style of “creep feed” grinding is not necessarily the way to get a “nice finish”. It’s more of a way to remove material quicker. So material removal vs. finish are two separate types of grinds. For example, if you were looking for a nice finish you definitely want to take a finish pass across the whole part with lead edge of the wheel (like a normal surface grinding pass); that surface you measured isn’t necessarily a “flat” surface either, you basically plunge ground the surface. Anyways, I totally agree that creep feeding is good way to remove material! Awesome grinder though!
None of this matters but I’ve spent many years of my career on a Mitsui Surface grinder doing close tolerance manual form grinding as a Mold Maker in the plastic injection mold industry.
I've worked in many shops over nearly forty years. Usually it's make precision parts on older, sometimes wore out, outdated machines.. Wouldn't know what to do in a shop so well equipped with high end equipment.
i mainly been a lathe machinist but i do run milling machines and some welding
Titan said it can do 1" deep cuts in hardened material. Please show that.
its possible if you go slow enough, like 20 mm/min
Creep Grinding is usually use to finish tight tolerance width of groove….
Good video & that grinding machine is smoooothhhhhh baybeee
How tf u gonna do 1Inch deep Cuts when 40thou Put it at 75% Load
I guess what he mean is shoulder grinding
Stay tuned ;)
It's possible, but the feed would be so slow that a 1" deep cut will take 10 years to complete.
@@awashbowler you better be paid by the hour not per part 🤣
As an old time tool maker retired , that is a scary set up . Would you gain any thing by blocking the part on the chuck ?
With the weight of the piece and the Magnetic table I would say it can hold itself in place easily
@@iamtyzed You would be surprised how many parts get launched from grinders. An extra 30sec in blocking your part could save a life. Grinding wheel explosions are ridiculous.
@@MattWindham the grinding wheel won’t break if you use recommended speeds and DOC and if you’ve checked the wheel before mounting
@@iamtyzed If everything is perfect nothing goes wrong.
Again, I would rather take an extra 30 seconds and do it right.
If the part slips and gets sucked into the wheel, the part will fly and the wheel will be gouged. Speeds, Feeds, and arbor mounting wont matter once the part slips.
I own a grind shop, I do this work every day.
Centerless, Cylindrical, Creep feed, thread grind, and traditional surface grind.
Toolmaker I apprenticed for taught me this way.
What happens if there is a power failure during a progressive cut? Does the spindle have a braking feature or does it freewheel as does traditional grinders? Just curious.
Yes, the variable speed spindle drive has a braking feature and will stop the wheel.
If you want a fun time check out the Makino G7 5 axis grinder.
Quick question….. why would you take big cuts with a grinding wheel when the end porpoise is surface finish not metal removal ? Thanks
Titan shows what tooling and machinery are capable of doing.
I really liked that airgun handle
What brand is it and how much does it cost?
This is fascinating
Is it correct to climb grind? I would think the opposite in case the mag didn't hold it would just push the part away rather than suck it in and possibly damage the wheel.
I'm trying to understand the definition. So regular grinding is a few thou at high feed rate, and creep grinding is deeper grind at slower feed rate?
exactly!
That's great, but where would this be useful? A one inch depth of cut on a surface grinder will take so long to do that you are better off milling the block. Maybe I'm old school, but surface grinding is meant to be a finishing operation, not a bulk material removal operation. There are faster ways in a shop to remove material.
Once he gets it all figured out he will be able to dress complex forms in wheel and finish hardened steel in one or two passes. A flat grind in soft 1018 i assume is just to feel the machine out and made a cool video.
Austin, that’s what I was thinking too….why grind it off like this, why not use an end mill or face mill? However I’m still learning the trade so my opinion doesn’t matter lol.
Creep feed grinding is useful especially for high precision profile grinding applications, e.g. steering racks, tooth racks, clipper blades, deep precision slots, etc. The advantage of creep feed grinding is that it leaves basically no burr, can be used on soft and hardened material and provides higher part quality (better surface finish, higher accuracy and closer form tolerances in comparison to milling and broaching processes).
Expecting a 1" doc demonstrated next
Wow i never knew that was possible
Herman Schmidt actually was interested in my work and stopped to listen to me and we talked about tools. I wonder about your shop. You're in Texas ?
Yes, we are in Flower Mound, just next to Dallas
Any advice on surface grinding titanium?
180 concentration 0.75k diamond wheel with 0.04" grooves running around the periphery. Rough and unorthodox I know but removes stock. Then an as3 grit in a 60 mesh with a j bonding to finish. Silicon impregnated if possible.
Why was the diamond vertical should be at an angle few degrees
Grit size?
That’s amazing! Where did you get you SCS, and F numbers from?
Your diamond dresser won't last long using it that way. Technology is great but knowledge is power.
Isso são muitas tretas, não é assim que se utiliza uma rectificadora plana.
lol our BLOHM grinder is like from the 80s lol .You havn"t experienced nothing to you have programed one of them bitches on the old greenscreen controller lol . You come back from lunch and not only is your part not there is just finishing up grinding the rest of your fixture off the table lmao ............
But how flat is it?
this is peanuts compared to what i do on my cnc grinder everyday. its a tricky business when you grind small parts and have to keep flatness and parallellness in mind with a surface finish within 0.4Ra. and match parts within 1 micron. nice machine tho. you can do lots of stuff with it. in this video you went cavemen style
For anyone watching this. Please never grind on this direction!
Why?.
1018 is soft and crap to grind. grind hardened steel and it will significantly improve your finish.
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Quit goofing around! Show us the 1" cut!!!
Uh... don't tease us with a 1" DOC and then not show us!
Круги tyrolit гавно, второй момент, круг не отбалансирован( дробление на обработанной поверхности). Правка круга не правильная! Так медленно править нельзя(зерно очень крупное)
Only slightly impressed.And airblast on a surface grinder???Big no-no,actually sacrilege.Blohm surface grinders are brilliant.Okamoto are close.
My observation over many decades: the level of tech is inversely proportional to actual skill.
You are correct Sir when comparing it to older Blohm machines systems like the HSF/SIMPLEX open guard models. Newer generation Blohm machines with fully enclosed work areas allow the usage of air pressure for cleaning purposes.
I pity the fool who tries that on their Harig 612.