Pat's Ebay Turbo Compound Boost Build
#1862
Retired Mech Design Engr
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On my manifold (not 4130) we had the standard cracking issues in the butt welds. I re-ground until there was actually a gap at each joint, as well as the 45* chamfer. Then we multi-pass TIG welded each joint. The first pass had to bridge the opening, so full penetration was somewhat guaranteed. Finally, the manifold has held up. Note: it is just a log.
I don’t know if multiple passes are legit on 4130.
On boiler tubes and pipelines, multiple passes are normal.
EDIT: Nope. No gaps, little chamfer for 4130. Miller Article
DNM
I don’t know if multiple passes are legit on 4130.
On boiler tubes and pipelines, multiple passes are normal.
EDIT: Nope. No gaps, little chamfer for 4130. Miller Article
DNM
#1864
If you don't mind me asking here, i'm binge watching through your channel and have a question. You used a Coballt drill bit from I believe Grainger (Episode 4)? Were these the ones you were using and how well do they cut through stainless?
https://www.grainger.com/category/machining/drilling-holemaking/drill-bits/drill-bits-for-metal-plastic/hex-shank-drill-bits?attrs=Material+-+Machining%7CCobalt&filters=attrs&categoryIndex=4
https://www.grainger.com/category/machining/drilling-holemaking/drill-bits/drill-bits-for-metal-plastic/hex-shank-drill-bits?attrs=Material+-+Machining%7CCobalt&filters=attrs&categoryIndex=4
#1865
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If you don't mind me asking here, i'm binge watching through your channel and have a question. You used a Coballt drill bit from I believe Grainger (Episode 4)? Were these the ones you were using and how well do they cut through stainless?
https://www.grainger.com/category/machining/drilling-holemaking/drill-bits/drill-bits-for-metal-plastic/hex-shank-drill-bits?attrs=Material+-+Machining%7CCobalt&filters=attrs&categoryIndex=4
https://www.grainger.com/category/machining/drilling-holemaking/drill-bits/drill-bits-for-metal-plastic/hex-shank-drill-bits?attrs=Material+-+Machining%7CCobalt&filters=attrs&categoryIndex=4
They last for quite a while in stainless or steel. Cobalt seems to last 3 or 4 times longer vs HSS bits.
Glad you're liking the channel!
#1866
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On my manifold (not 4130) we had the standard cracking issues in the butt welds. I re-ground until there was actually a gap at each joint, as well as the 45* chamfer. Then we multi-pass TIG welded each joint. The first pass had to bridge the opening, so full penetration was somewhat guaranteed. Finally, the manifold has held up. Note: it is just a log.
I don’t know if multiple passes are legit on 4130.
On boiler tubes and pipelines, multiple passes are normal.
EDIT: Nope. No gaps, little chamfer for 4130. Miller Article
DNM
I don’t know if multiple passes are legit on 4130.
On boiler tubes and pipelines, multiple passes are normal.
EDIT: Nope. No gaps, little chamfer for 4130. Miller Article
DNM
#1868
I use these: https://www.grainger.com/category/ma...&filters=attrs
They last for quite a while in stainless or steel. Cobalt seems to last 3 or 4 times longer vs HSS bits.
Glad you're liking the channel!
They last for quite a while in stainless or steel. Cobalt seems to last 3 or 4 times longer vs HSS bits.
Glad you're liking the channel!
I have an old drill press I got from a family member that goes down to I think 450rpm. I don't mind spending a bit more per bit if that means it'll last longer.
#1869
HSS Twist Drill Recommended Speeds, Feeds, and Point Angles
Might not be slow enough if you get into bigger diameter stuff. You really want to be 30-50 SFM, and that's ~230-390RPM with a half inch bit.
A cobalt will take more heat before it goes soft, but not that much. Maybe go cobalt for the bigger bits you can't slow down enough. Either way, HSS is going to work a lot better if you've got a rigid setup and a nice constant feed.
Might not be slow enough if you get into bigger diameter stuff. You really want to be 30-50 SFM, and that's ~230-390RPM with a half inch bit.
A cobalt will take more heat before it goes soft, but not that much. Maybe go cobalt for the bigger bits you can't slow down enough. Either way, HSS is going to work a lot better if you've got a rigid setup and a nice constant feed.
#1873
Have you seen the 1000:1 inverter duty motor swaps? I wouldn't be messing with anything else. You want torque? This is torque. Get a motor with encoder and do rigid tapping. There's ways to hook the CNC controller up to the VFD to have full control over the spindle.
https://www.cnczone.com/forums/bench...formation.html
https://www.cnczone.com/forums/bench...formation.html
#1874
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I have not, but that sounds awesome. I will check that out tonight. A good motor with encoder would be the best for sure, I thought that would be too pricey though but maybe not.