- Joined
- Nov 23, 2017
- Messages
- 1,191
Sadly no. That's a 974 Chas Parker with flat jaws I bought that on fleebay for $150Great score(s)! Was the vise part of the deal????
Sadly no. That's a 974 Chas Parker with flat jaws I bought that on fleebay for $150Great score(s)! Was the vise part of the deal????
Those boring bars work OK, but often need to be properly ground first. Often there is not enough relief under the cutting edge, especially when boring smaller holes. The rubbing below the cutting edge can be seen if you you look carefully. If so, the steel shank and the brazed carbide can be ground (separately) to make more clearance. The quick and dirty fix is to roll the bar downward a bit to a negative rake, which also changes the geometry to give more clearance. Change the tool height to keep the cutting edge on center. Amazingly, I have got very good results with the negative rake cutting angle. Moving the tool above center also gives more relief, though I have not had so good results with trying it... Unfortunately, grinding the carbide requires diamonds to do a good job, Silicon Carbide wheels can be used for roughing, and the edges will be rough afterwards. They can be finished honed with a diamond "file" or diamond "credit card."Cheapo boring bars. Could have been a waste of $15?
Cheapo boring bars. Could have been a waste of $15?
Bob,Those boring bars work OK, but often need to be properly ground first. Often there is not enough relief under the cutting edge, especially when boring smaller holes. The rubbing below the cutting edge can be seen if you you look carefully. If so, the steel shank and the brazed carbide can be ground (separately) to make more clearance. The quick and dirty fix is to roll the bar downward a bit to a negative rake, which also changes the geometry to give more clearance. Change the tool height to keep the cutting edge on center. Amazingly, I have got very good results with the negative rake cutting angle. Moving the tool above center also gives more relief, though I have not had so good results with trying it... Unfortunately, grinding the carbide requires diamonds to do a good job, Silicon Carbide wheels can be used for roughing, and the edges will be rough afterwards. They can be finished honed with a diamond "file" or diamond "credit card."
Unfortunately I can only use a 3/8” bar in my AXA Aloris QCTP. I didn’t look very hard, but I didn’t find any beefy affordable 3/8” bars. (1/2” fits, but the tool edge is above center) Figured I’d try to HotRod these. If buying these is the biggest mistake I make all year it will be a VERY good year!that was one of the biggest mistakes I've made this year, I have the same set they are garbage. I bought a 1/2"carbide insert boring bar from mesatool.com works great in my boring head.