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Parabolic drills cutting oversized holes
boslab - I always check the lands. I'm old enough to remember grinding drills to get the size I didn't have. Then there was a feel involved since holes were made on a drill press or using the quill on a Bridgeport. CNC takes away that feel. Great stuff at times, a pain in others. -
Parabolic drills cutting oversized holes
I checked the run-out and lands first. Both were fine. So I ran a few more trials. I can't say I am, any closer to an AH HA moment but here's the latest. First I ran 4 holes all spot with 140deg down .05. 2 holes ran at .002 feed - good holes, .343 pin. Second two ran pre-drill with 11/32... -
Parabolic drills cutting oversized holes
I agree that drilling isn't the way to get a precise hole but I do expect plus/minus .005. Within my tolerance. I'm getting +.018 and unpredictable. My drill is running true, I indicated the cutting surface to assure a center grind. Can this be from too hard of an initial push? I start at... -
Parabolic drills cutting oversized holes
Here are my thoughts on parabolics, perhaps you can help correct any incorrect assumptions. Parabolic by design have a thicker web and are therefore more rigid. I like the chip removal characteristics much better than a standard twist drill, the drill seems to manufacture chips instead of the... -
Parabolic drills cutting oversized holes
I’ve hit a pretty consistent problem. Drilling 6061-T6 with parabolic drills I get oversized holes if I’m anywhere close to manufacturers speed and feed. Today is an example; .3438(11/32) Guhring parabolic, bright. Drilling .75 deep. Small spot using 3/8 140deg spot. Manufacturers data was... -
Reid 618
I have come in to possession of a Reid 618 with roller ways. There are a few issues but the most concerning is the x axis feed feels 'stiff'. My expectation would be for that axis to move with a minimum of torque on the wheel. It moves smoothly but it does require much more effort than I am...- tgford58
- Thread
- Replies: 2
- Forum: Abrasive Machining
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Manual for SPI radius angle dresser
Thank you. I appreciate the information and you are correct. Model may be helpful. I'm not as accomplished on the surface grinder as I would like. I enjoy the machine, probably because of my lack of familiarity. My goal for the dresser is to be able to going a flat that transitions to a .100...- tgford58
- Post #4
- Forum: Abrasive Machining
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Manual for SPI radius angle dresser
I purchased an excellent condition SPI radius dresser. Unfortunately there were no manuals. Does anyone know where I can find manuals or does anyone own the manuals so I can get copies? Thank you for the help.- tgford58
- Thread
- Replies: 5
- Forum: Abrasive Machining
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220 two lead to 220 single lead transformer
I am attempting to wire a 3-phase 220v surface grinder through a Hitachi NES1-015SB VFD. I have single phase 220 into the shop but the Hitachi requires 220 on one leg. Can anyone give me some assistance on what type, model, make of transformer I need to use for this application? Thank you...- tgford58
- Thread
- Replies: 1
- Forum: Transformers, Phase Converters and VFD
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NFA vs. Sons of Guns question??
For a group of people that seem somewhat aghast at the show - it sure seems like everyone watches it. As a Type 7 Class 2 SOT - I don't have a problem with the show. How may posters have skin in the game? It is supposed to be entertainment. Firearms manufacture isn't very entertaining. As for...- tgford58
- Post #17
- Forum: Gunsmithing
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Snake skin serrations
Has anyone had experience cutting the 'snake skin' or 'dragon skin' serrations? I think I have the set-up and sequence worked out but would like some feedback to cut the trial curve. Thanks- tgford58
- Thread
- Replies: 0
- Forum: Gunsmithing
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H&R 929 Revolver Timing issue.
A couple of questions. Does the cylinder rotate freely on the crane? if so, can you pull the mammer back to full cock? If yes to both of these can you see the hand come through the slot and try to engage the cylinder ratchet and finally if all of that happens does the cylinder bolt drop out of...- tgford58
- Post #3
- Forum: Gunsmithing
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Gun Law Question
I will have to investigate that one further. As a Type 7 FFL holder and manufacturer I know of falling under the FAET tax requirements once moving past the small manufacturer limits but I have never had the ITAR issue come up either with the DOJ or BATFE. I am not particularly surprised...- tgford58
- Post #5
- Forum: Gunsmithing