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All Replies on Tell me this is a bad idea - shortening too long router bit

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View WorksInTheory's profile

Tell me this is a bad idea - shortening too long router bit

by WorksInTheory
posted 12-03-2018 07:28 PM


20 replies so far

View splintergroup's profile

splintergroup

2780 posts in 1677 days


#1 posted 12-03-2018 07:39 PM

You can cut it off (at the collet end) if you leave enough material to still get a good grip on the shaft and actually have a way to cut carbide cleanly. Using a diamond cut off disc comes to mind, but keep the metal cool if you use some kind of abrasive cutter.

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WorksInTheory

177 posts in 2057 days


#2 posted 12-03-2018 07:45 PM

i was going to use a grinder w/ cut off disc. My other options would be jig saw with metal cutting blade.


You can cut it off (at the collet end) if you leave enough material to still get a good grip on the shaft and actually have a way to cut carbide cleanly. Using a diamond cut off disc comes to mind, but keep the metal cool if you use some kind of abrasive cutter.

- splintergroup


View splintergroup's profile

splintergroup

2780 posts in 1677 days


#3 posted 12-03-2018 07:50 PM

The grinder/CO disk should work, but the disk is also carbide so cutting may go slow depending on which object is softer. Have a cup of water handy to quench as you would when using a grinder to sharpen a chisel.

View WorksInTheory's profile

WorksInTheory

177 posts in 2057 days


#4 posted 12-03-2018 08:20 PM

Haha at first I read this as a cup of water so I can take a break and take a drink… then I was really going to say a beer would be better. But then again shouldn’t operate dangerous equipment while drinking.


The grinder/CO disk should work, but the disk is also carbide so cutting may go slow depending on which object is softer. Have a cup of water handy to quench as you would when using a grinder to sharpen a chisel.

- splintergroup


View Jeff's profile

Jeff

507 posts in 3650 days


#5 posted 12-03-2018 08:37 PM

Probably the best option is to buy another bit. This sounds like a straight cutting bit, right? Not too expensive even in carbide. I don’t think I have any other bit with a profile that’s got a solid carbide shaft.

View DS's profile

DS

3237 posts in 2876 days


#6 posted 12-03-2018 08:41 PM

If you use a regular tool/blade sharpening service they can usually shorten a router bit without much debate.
Most major metro areas have 3 or 4 companies in town that do this cheaply. (And accurately)

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View SMP's profile

SMP

1318 posts in 361 days


#7 posted 12-03-2018 09:00 PM



Probably the best option is to buy another bit. This sounds like a straight cutting bit, right? Not too expensive even in carbide. I don t think I have any other bit with a profile that s got a solid carbide shaft.

- Jeff

I’d probably do that too and use this as a card scraper burnisher. I’ve cut carbide with my HF cut off grinder, but I don’t think I would on something I wanted to retain the RC rating.

View WorksInTheory's profile

WorksInTheory

177 posts in 2057 days


#8 posted 12-03-2018 09:18 PM

What is an RC rating?

I guess $70 bucks could be considered not that expensive but rather spend that money on bits I don’t have like 3/8”, etc. But if it not cuttable or ruin the bit then I won’t.

BTW it says cutting length is 2-1/8” and so therefore the shank part is 1-7/8. If I take 1/4” off then I would have 1-3/8” left… is that enough length for safe collett clamping?

View GrantA's profile

GrantA

1707 posts in 1863 days


#9 posted 12-03-2018 09:18 PM

What’s the cutting length? I might be interested in it

View HokieKen's profile

HokieKen

10446 posts in 1594 days


#10 posted 12-03-2018 09:24 PM

You can cut it. Although a solid carbide shank is gonna eat up a grinder wheel. I use a diamond cutoff wheel in my dremel to cut carbide. But I don’t usually cut a 1/2” solid shank of it. If you have a machine shop or a tool and die shop nearby, they would probably shorten it for not much money provided they have the appropriate equipment.

-- Kenny, SW VA, Go Hokies!!!

View Bill Berklich's profile

Bill Berklich

882 posts in 844 days


#11 posted 12-03-2018 10:30 PM

Lol… Sell it on eBay for $55 and buy the right one. If you muck up the cutting I’d hate to be around if it comes apart at 10-15,000 rpm.

-- Bill - Rochester MI

View Kazooman's profile

Kazooman

1335 posts in 2407 days


#12 posted 12-04-2018 01:05 AM



Lol… Sell it on eBay for $55 and buy the right one. If you muck up the cutting I d hate to be around if it comes apart at 10-15,000 rpm.

- Bluenote38

Amen. This is not a big enough deal to go through all of the PITA you would need to make it fit your situation. Cut your losses and sell it or give it away. Cutting a solid carbide bit in the average home shop sounds like either an exercise in futility or a disaster waiting to happen. You could easily invest more in the cutting supplies than the cost of the bit. Paying someone with the gear and know how to do the job also sounds like an expense worth more than the original cost of the bit. Part ways with the bit, even if at enough of a loss to remember the lesson. You will be happy to see it go to a good home.

View therealSteveN's profile

therealSteveN

3395 posts in 1029 days


#13 posted 12-04-2018 01:23 AM


If you muck up the cutting I d hate to be around if it comes apart at 10-15,000 rpm.

- Bluenote38

Seeing as how there isn’t a “how to” on doing this, “muck up” may be a certainty. Do they sell Kevlar underwear for woodworkers? Kevlar, and bulletproof glass headgear?

Seriously I have been zinged a number of times with carbide teeth off of TS blades, good eye wear should be fine.

-- Think safe, be safe

View robscastle's profile

robscastle

6274 posts in 2659 days


#14 posted 12-04-2018 04:38 AM

Thats a bad idea, read the sell it posts, and all the other warnings or call Grant and then act.
Next step go buy the correct size one.

Failing that fit a fat base on your router and use it “as is”
Solid carbide yes they exist I have a couple of 1/4 and 1/2” spiral bits, they are CMT from memory
The mass alone will tell you if its solid carbide, failing that use a magnet.

Howard Hughes of the Hughes Tool Company made his fortune many years ago with complex solid carbide cutters called tricone and they offered a service resharpening them, maybe you could contact them, you can still buy them today, I think they trade as Baker Hughes these days, I know for sure Howard is out of it.

Let me know if you if you need an upate on more useless trivia

-- Regards Rob

View robscastle's profile

robscastle

6274 posts in 2659 days


#15 posted 12-04-2018 04:49 AM

.

-- Regards Rob

View WoodenDreams's profile

WoodenDreams

679 posts in 366 days


#16 posted 12-04-2018 06:16 AM

If you don’t want to return it, or sell it. put it in you router bit collection for future use. If you a distributor in your area that specializes in equipment for the fabricators & metal workers. they could cut it down on one of their floor models. They’re more than happy to show you how well the equipment works, in hopes of selling some equipment to you. I went into a local distributor for a rubberized deburring wheel, the salesman knew I only wanted a deburring wheel, but, he wanted to show me the differences between each equipment, and also demonstrated the differences for a possible sale in the future.

View GrantA's profile

GrantA

1707 posts in 1863 days


#17 posted 12-04-2018 12:06 PM



You can cut it. Although a solid carbide shank is gonna eat up a grinder wheel. I use insert tooling in my metal lathe to cut carbide. But I don t usually cut a 1/2” solid shank of it. If you have a machine shop or a tool and die shop nearby, they would probably shorten it for not much money provided they have the appropriate equipment.

- HokieKen


Fixed it for you Kenny!

View HokieKen's profile

HokieKen

10446 posts in 1594 days


#18 posted 12-04-2018 01:57 PM

My tooling is all carbide or HSS. Nothing I’m gonna tackle a carbide bit with but I don’t mind if you do ;-)

-- Kenny, SW VA, Go Hokies!!!

View 000's profile

000

2859 posts in 1354 days


#19 posted 12-04-2018 02:23 PM


If you use a regular tool/blade sharpening service they can usually shorten a router bit without much debate.
Most major metro areas have 3 or 4 companies in town that do this cheaply. (And accurately)

- DS

^This for sure. Probably wouldn’t charge too much.

I would just keep it though, and get a new one.

Someone without the right tooling could get it hot and warp/ruin the bit if not done properly.

View WorksInTheory's profile

WorksInTheory

177 posts in 2057 days


#20 posted 12-04-2018 05:23 PM

Thank you for the “talking me off the ledge”. You are all right – I won’t do it and just take the hit and get another one that’s shorter. See who said longer was better… cough ahem.. especially if you can’t plunge. ba dum dum.

Sorry bad joke.

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