JohnMartin
Hot Rolled
- Joined
- Jul 8, 2006
- Location
- Cumberland, Maine
I need to make some reducer bushings for a Gorton pantograph. The pantograph has a 5/16” collet, and I need reducers to 1/8” and 3/16”.
I’m starting with drill bushings, already hardened, 3/4” length under the head. So all I will have to do is slot them. One slot all the way across from each end, to within maybe 3/16” of the opposite ends. Plan to hold them in a rod bored to 5/16”, which would then be held in a collet fixture. I don’t have coolant on my surface grinder, so grinding will be dry.
I’ve got 7” x .035” wheels, reinforced and non-reinforced. Which should I use? For a shallow slot I’d be comfortable with the non-reinforced, but as I’ll be going almost 3/4” deep would the reinforced wheel be a better choice? Both wheels are 60 grit. Will they leave comparable burrs? I can stone off outside burrs, but any on the inside will be more difficult.
I’d prefer to have narrower slots, especially on the 1/8” bushing. I see that .015” and .020” rubber-bonded wheels are available. Would these be a problem?
Plunge in one pass, or feed longitudinally with small depth increments?
I’d much prefer to do these with a slitting saw, but like the idea of starting with pieces that are already to size and will require no hardening.
Would appreciate any advice.
I’m starting with drill bushings, already hardened, 3/4” length under the head. So all I will have to do is slot them. One slot all the way across from each end, to within maybe 3/16” of the opposite ends. Plan to hold them in a rod bored to 5/16”, which would then be held in a collet fixture. I don’t have coolant on my surface grinder, so grinding will be dry.
I’ve got 7” x .035” wheels, reinforced and non-reinforced. Which should I use? For a shallow slot I’d be comfortable with the non-reinforced, but as I’ll be going almost 3/4” deep would the reinforced wheel be a better choice? Both wheels are 60 grit. Will they leave comparable burrs? I can stone off outside burrs, but any on the inside will be more difficult.
I’d prefer to have narrower slots, especially on the 1/8” bushing. I see that .015” and .020” rubber-bonded wheels are available. Would these be a problem?
Plunge in one pass, or feed longitudinally with small depth increments?
I’d much prefer to do these with a slitting saw, but like the idea of starting with pieces that are already to size and will require no hardening.
Would appreciate any advice.