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Router bits and bushings - slipping

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Forum topic by unclearthur posted 05-19-2019 05:17 PM 505 views 0 times favorited 12 replies Add to Favorites Watch
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unclearthur

256 posts in 2177 days


05-19-2019 05:17 PM

For the first time, I tried using a bushing adapter in my router, and despite tightening the collet far more than usual, the bit kept slipping. Tried on another router / collet – same result.

It was a 5/6” upcut spiral bit with a 1/2” to 5/6: bushing adapter, all from Lee Valley, both new.

Collets are clean. And the cuts were relatively light, in softwood.

Not a crisis but I was just wondering if others have problems with bushing adapters? I’m not sure I want to crank down on the collet any more than I already have.


12 replies so far

View bigblockyeti's profile

bigblockyeti

5744 posts in 2110 days


#1 posted 05-19-2019 05:29 PM

What is the make, model and age of your router?

-- "Lack of effort will result in failure with amazing predictability" - Me

View CarlosInTheSticks's profile

CarlosInTheSticks

286 posts in 761 days


#2 posted 05-19-2019 06:02 PM

Your collets may be clean, but if you have used them for a long time they will have some wear. If you were not using a bushing this would not normally be a problem until they get so worn you can no longer hold a bit tightly. Using a bushing is in effect putting a collet inside a collet. You tighten the router collet to the inside collet and then have to continue to tighten, so the inside collet can tighten to the bit. This may require an extra turn and more force because you are now tightening two collets instead of one. You will reguire a lot more force to get as tight on the bit with 2 collets than you would with one. Ideally your 1/2” collet would be sized to take the 5/16 bit. Using a bushing is a sloppy second but sometimes unavoidable.

I would try to tighten it a little more, (hopefully nothing breaks). If it still slips the bushing will wear and make the problem worse.

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CarlosInTheSticks

286 posts in 761 days


#3 posted 05-19-2019 06:39 PM

You got me thinking some more, If you line up the two slots in the collet and bushing before tightening, you will get more efficient tightening and may solve some of the problem.

View AndyJ1s's profile

AndyJ1s

42 posts in 144 days


#4 posted 05-19-2019 07:34 PM

Nesting collets is never a good idea, especially if one is a single slit 8 mm collet/adapter, as shown for the LV bit’s adapter.

Worse, a single slit 8mm collet/adapter is a poor fit for a 5/16” diameter shank.

Does your router manufacturer offer an 8mm multi-slit collet (not adapter) for your router? If so, use that.

Otherwise, get a 5/16 upcut spiral bit with an integral half-inch shank. Woodcraft has several, even an Onsrud HSS bit at a price similar to LV’s bit+adapter.

Andy

View therealSteveN's profile

therealSteveN

2826 posts in 963 days


#5 posted 05-19-2019 09:39 PM

I have a Bosch that I hate the collet on, it’s a must use 2 wrenches, and it isn’t easy getting to. I use this on a table mostly for Shaker doors, and for a lock miter. The lock miter is 3 1/8” diameter, and is pretty hefty as far as router bits go. I’m not rally sure of the weight, but I had some slipping with the POS collet Bosch sends with them. It's this bit

I asked around, and talked to Lewis the Router Boss, he suggested swapping it for a Quick Change Chuck I Love it, works famously, quick is a word, this thing is like lightening. Holds like a champ. Only downside I can see is it costs a bit, not break the bank, but not TaiChinese cheeep.

Took a POS router, IMHO, and turned it into my favorite router. Welllll the on off switch sux, but?? What ya gonna do.

It is a replacement for the chuck, not an extension. Watch the video on the page from the second link.

-- Think safe, be safe

View unclearthur's profile

unclearthur

256 posts in 2177 days


#6 posted 05-20-2019 05:06 AM



What is the make, model and age of your router?

The first one is a maybe 10-15 year old Porter Cable 690 series (where you can swap the plunge base and fixed base); the other is a 5 year old Triton MOF001 (the smaller 2 hp Triton). The collets are original, but the 1/2” collet was never used much on the Porter Cable as for the longest time I only had 1/4” bits.

I would try to tighten it a little more, (hopefully nothing breaks).

Is it possible to over-tighten / damage the collett or something else?
Does your router manufacturer offer an 8mm multi-slit collet (not adapter) for your router?

Not that I could find via Google. Probably not available in Canada even if they do.
Otherwise, get a 5/16 upcut spiral bit with an integral half-inch shank. Woodcraft has several, even an Onsrud HSS bit at a price similar to LV s bit+adapter.

Thanks …....that makes sense

Thanks for the replies everyone.

View Fred Hargis's profile

Fred Hargis

5545 posts in 2882 days


#7 posted 05-20-2019 10:42 AM

There are 8MM collets available for your PC, whether they ship north I don’t know, but it wouldn’t hurt to ask. I have several Elaire collets (including an 8MM), they are top notch. I hate, and will not use, split sleeves.

-- Our village hasn't lost it's idiot, he was elected to congress.

View CarlosInTheSticks's profile

CarlosInTheSticks

286 posts in 761 days


#8 posted 05-20-2019 01:00 PM

I would try to tighten it a little more, (hopefully nothing breaks).

Is it possible to over-tighten / damage the collett or something else?

- unclearthur

If you continually overtighten you can damage the threads or crack the tightening nut. Over four decades ago I had a Craftsman router that I over tightened and broke one of the spider arms cast into the router motor bottom cover which houses the bottom bearing.

I never throw anything out, so here is a picture of the broken spider on the 40 year old router. The broken nubs can be seen on the edges.

View BuckeyeDennis's profile

BuckeyeDennis

20 posts in 88 days


#9 posted 05-20-2019 01:12 PM

I had also had slipping problems with the 1/2” to 1/4” reducer sleeve that was included with my older Triton TRA001 3-1/4 hp router. Newer TRA routers come with an MOF-style chuck, for which several collet sizes (including 1/4” and 8 mm) are available. I upgraded my router with the MOF-style chuck, and bought new collets and a collet wrench for them. Problem solved, and the new-style collets are a major improvement.

The collets are hard to find in the US, but ToolSparesOnline in the UK stocks them. I suspect that they have a US warehouse as well, as the shipping costs were very reasonable, and my upgrade parts arrived in just a few days.

The various Triton collets and chucks available are described in this PDF document from ToolSparesOnline.

Here's a link where you can order collets and other parts for your MOF001.

Should anyone else need to upgrade the chuck on an older TRA001 (to accept the new-style collets), the method described in this link worked quick & easy for me.

-- Dennis 'We are all faced with a series of great opportunities, brilliantly disguised as impossible situations.' Charles Swindoll

View Madmark2's profile

Madmark2

461 posts in 977 days


#10 posted 05-20-2019 01:51 PM

I let scum (surface rust) grow on my bit shafts and never lube them. The rougher surfaces on the adapter and bits grip like anything and never slip. Of course I always crank the bits as tight as my grip will allow. If that breaks the collet then the collet is defective.

M

View Jeff's profile

Jeff

507 posts in 3584 days


#11 posted 05-20-2019 01:58 PM

Hard to believe you couldn’t get a metric collet in Canada. Perhaps you could call Lee Valley and discuss the situation. Their customer service is top notch.

View unclearthur's profile

unclearthur

256 posts in 2177 days


#12 posted 05-20-2019 07:48 PM

Thanks for the advice and links everyone. I think I will start hunting down some new collets, though a trip across the border may be required. Availability of stuff up here is nothing like in the U.S.

Supplemental question: Do you think there is a significant difference between an 8 mm collet and a 5/16 collet?

(Lee Valley’s sells their 1/2” to 8mm bushing adapter as an accessory to the 5/16” but it didn’t seem to work for me. Alternatively, it looks like Eclaire (see link above) sells a separate 5/16 and 8 mm collet (though its impossible to know if its two different collets or two different names for the same collet).

By my calculation the difference between the two is about 0.0625 mm or about 2 1/2 thousands of an inch. Significant?

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