2Slow
Hot Rolled
- Joined
- Jun 26, 2006
- Location
- South East Michigan, USA
I have to drill a small (#62) through hole in the center of a 1" long grade 5 bolt. Actually I have a few to do. I need a pair of #63s, a pair of #62s, and a pair of #61s. These are jets for a Stanley Steamer burner.
I tried tonight and things didn't go great.
I held the bolt (1/4-28) in a collet.
I touched the bolt head with a center drill.
I used one of those sliding attachments that for a small chuck and lets you feed it by sliding with your hand to hold the #62 bit & ran the machine at 2,000 RPM
The bit was a 118 degree point, HSS from Irwin Hansen #61 - #80 kit.
https://www.amazon.com/gp/product/B000EB3YL2/ref=oh_aui_search_asin_title?ie=UTF8&psc=1
I started with a #61, but it really didn't want to cut. After going about a 1/4" deep it took a lot of pressure and didn't cut, so I went down to a #62. The # 62 cut well for about 1/2" more, but then I snapped the stupid thing in the bolt...
So I need a couple of new bits. Debating between solid carbide for 10 bucks each, or a dozen 135 degree HSS for $1.38 each from McMaster Carr.
Thoughts?
-Joe
I tried tonight and things didn't go great.
I held the bolt (1/4-28) in a collet.
I touched the bolt head with a center drill.
I used one of those sliding attachments that for a small chuck and lets you feed it by sliding with your hand to hold the #62 bit & ran the machine at 2,000 RPM
The bit was a 118 degree point, HSS from Irwin Hansen #61 - #80 kit.
https://www.amazon.com/gp/product/B000EB3YL2/ref=oh_aui_search_asin_title?ie=UTF8&psc=1
I started with a #61, but it really didn't want to cut. After going about a 1/4" deep it took a lot of pressure and didn't cut, so I went down to a #62. The # 62 cut well for about 1/2" more, but then I snapped the stupid thing in the bolt...
So I need a couple of new bits. Debating between solid carbide for 10 bucks each, or a dozen 135 degree HSS for $1.38 each from McMaster Carr.
Thoughts?
-Joe