carbide insert replacements

[Sam Fleisher]

Occasionally I will use a carbide tool. Lately mostly to turn some brass and copper ferrules on tool handles etc.. This has caused me to need some replacement bits.

Looking around I see there's a negative rake insert available in the size I use. Is this a thing I need or should I just stick to the regular ones? If I get some to play with are they used level like normal carbide or is there a different way to present to the work?

 

[Bob Hall]

Occasionally I will use a carbide tool. Lately mostly to turn some brass and copper ferrules on tool handles etc.. This has caused me to need some replacement bits.

Looking around I see there's a negative rake insert available in the size I use. Is this a thing I need or should I just stick to the regular ones? If I get some to play with are they used level like normal carbide or is there a different way to present to the work?

FWIW

I have one for my Rikon and I like it. It works good for me for that final pass to flatten the bottom of the bowl and the transition to the side wall. It also helps remove tool marks.

Bob

 

[Sam Fleisher]

FWIW

I have one for my Rikon and I like it. It works good for me for that final pass to flatten the bottom of the bowl and the transition to the side wall. It also helps remove tool marks.

Bob

Do you use it just like any other carbide? 90 degrees from the tool rest or do you present it differently?

 

[Charles Cadenhead]

Do you use it just like any other carbide? 90 degrees from the tool rest or do you present it differently?

Yes, you don't use it any differently than a regular one. Try it and see if you like it.

 

[Mark Jundanian]

Like Charles said, you use the negative rake carbide scrapers the same way you use the single bevel scrapers. The NRS create somewhat less tear out on wood, but don't do as well at removing wood (which is why I use them on the last passes). The NRS produce a much smoother surface on acrylics (etc) than single bevel. I don't know how they would perform on metals.

 

[Sam Fleisher]

I ended up just ordering the ones that I know fit my Chinese knockoffs. Couldn't find any info on what screw size the nr ones had and didn't know if they would fit mine. Is there a standard for that? They all use the same screw or not? A way to read what they are by the numbers?

 

[Bill Alston]

Not done it myself but someone suggested just using a standard insert mounted at an angle. This obviously assumes folks can make their own tools though. I think the reason for this is that the negative rake inserts are approaching double the price of the standard ones. I’ve found a new supplier in the UK that sells them at very reasonable prices though.

 

[John Grace]

Occasionally I will use a carbide tool. Lately mostly to turn some brass and copper ferrules on tool handles etc.. This has caused me to need some replacement bits.

Looking around I see there's a negative rake insert available in the size I use. Is this a thing I need or should I just stick to the regular ones? If I get some to play with are they used level like normal carbide or is there a different way to present to the work?

I found a NR insert for my EWT finishing tool. Tried it a number of times and simply not particularly happy with it. Decided I'll either stick with my traditional scraper tools or the Mike Thompson's 'flute-less gouge'. My EWTs have their place when needed but the NR just isn't one of them for me....individual results may vary as they say.

 

[Bill Alston]

Thanks John, I’ll save my money and look at something else.

 

[stu senator]

<https://azcarbide.com/>
Has a good converter chart and mentions the preferred screw sizes in many cases

 

[Neb Skram]

Thanks John, I’ll save my money and look at something else.

i have had lots of luck looking on this site for cutters

https://www.aliexpress.us/w/wholesale-carbide-negative-rake.html?spm=a2g0o.productlist.auto_suggest.1.2380B2TOB2TOmp

 

[Jonathan Harkins]

<https://azcarbide.com/>
Has a good converter chart and mentions the preferred screw sizes in many cases

Quality place to deal with. Ron will be able to tell you what is needed and probably has it in stock.

 

[Alan Weinberg]

Quality place to deal with. Ron will be able to tell you what is needed and probably has it in stock.

He’s gone till the 13th though

 

[Bill Alston]

I ended up just ordering the ones that I know fit my Chinese knockoffs. Couldn't find any info on what screw size the nr ones had and didn't know if they would fit mine. Is there a standard for that? They all use the same screw or not? A way to read what they are by the numbers?

There are several different screws used for carbide inserts, excluding Philips, Pozidrive and Slotted. I don’t even recommend the use of Hex screws either (number 1 in the picture) as they can round off quite easily in the smaller sizes. Torx screws are best. The only place I’ve found over here that can supply all the different types is Steve at Ride The Bevel.

Welcome to Ride the Bevel

Welcome to my new RidetheBevel online shop! We supply woodturning makers with carbide insert cutters at reasonable prices.

www.ridethebevel.co.uk

All these screws are the same thread (M4) You can see the obvious difference in head sizes. Number 2 is a standard Torx carbide insert screw used extensively on metal turning tools. Screws 3 and 4 are, as far as I know made for planer blade inserts?

 

[Steve Worcester]

<https://azcarbide.com/>
Has a good converter chart and mentions the preferred screw sizes in many cases

If and when I need replacement cutters, even for Hunter tools, that is my goto. I usually but a 10 pack

 

[Bill Alston]

I bought a couple of round NR carbide inserts to try, they were only £4 each. I bought a 9mm and a 15mm. I’ve not tried the smaller one yet but the other one worked surprisingly well on an end grain box. It removed more material than expected and left a pretty good finish. I may buy a square one next time.