Thread: Replacement spiral cutter blades?

Originally Posted by sje-tools

They are some expensive inserts!!! (then again they are cheaper than Carbatec!)

So I guess if I was stocking them and selling them at AU$3.80 ea rather than AU$9.20 ea (!) people might be interested!?!?

Ah yup, I guess you'd be right!

I'm still only on the first edge of my set (4 edges) but they are due to be rotated pretty soon.

Do your cutters have 2 or 4 edges? I seem to recall reading it was 2.

I may be able to get a more accurate fix on the height of the arc with a feeler gauge.

Originally Posted by FenceFurniture

Ah yup, I guess you'd be right!

I'm still only on the first edge of my set (4 edges) but they are due to be rotated pretty soon.

Do your cutters have 2 or 4 edges? I seem to recall reading it was 2.

I may be able to get a more accurate fix on the height of the arc with a feeler gauge.

These would have 4 cutter edges, the 2 edge ones are for the spiral cutters (not the helix!)

Well the common radius are 100mm, 115mm and 150mm - so if you have a compass handy or even print a few curves on CAD you cut easy place a cutter against the line and see what it has.

Originally Posted by sje-tools

These would have 4 cutter edges, the 2 edge ones are for the spiral cutters (not the helix!)

Well the common radius are 100mm, 115mm and 150mm - so if you have a compass handy or even print a few curves on CAD you cut easy place a cutter against the line and see what it has.

4 is good then!

I can be quite accurate about the radius with the following formula (once I get a fix on the height of the arc:

radius = ½h +w²/h/8

where h is the height of the arc and w is the width

so, if the height is 0.25mm and the width is 13.45 then
r = 0.125 + 13.45*13.45/0.25/8
= 0.125 + 90.45
= 90.575 (it will pretty obviously fall into one of the radii that you mentioned, so the arc height will be different - that's just an eyeball)

In a little while I'll dig out the feeler gauge and then also compare the calculation to a compass drawn arc.

Check back in around 12.30 ESDT.

Hmmm. Not sure I can get an accurate fix with either a feeler gauge or the compass arcs.

There is just too much margin for error trying to butt the cutter up against a straight edge and then measuring the gap because it can be lopsided and so on.

I drew 4 arcs: 90, 100, 115 & 150mm radius.

The cutter matches both 115 & 150mm arcs: in other words I couldn't be certain because again the margin for error is too big (or small or something). It is definitely not a match for 100mm or less.

However, what I can say with certainty is that for a 150mm match, the height of the arc would be 0.15mm or 6 thou (which makes a radius of 150.8mm). For a 115mm radius it would be an arc height of 0.197mm or a shade under 8 thou.




I suppose that because I couldn't discern a difference between 115 and 150mm arcs that would surely mean that it wouldn't matter much if it was either.

If you like I can post a new one to you (cost of a stamp only, so no big deal). I have a box of 10 spares.

Originally Posted by FenceFurniture

Hmmm. Not sure I can get an accurate fix with either a feeler gauge or the compass arcs.

There is just too much margin for error trying to butt the cutter up against a straight edge and then measuring the gap because it can be lopsided and so on.

I drew 4 arcs: 90, 100, 115 & 150mm radius.

The cutter matches both 115 & 150mm arcs: in other words I couldn't be certain because again the margin for error is too big (or small or something). It is definitely not a match for 100mm or less.

However, what I can say with certainty is that for a 150mm match, the height of the arc would be 0.15mm or 6 thou (which makes a radius of 150.8mm). For a 115mm radius it would be an arc height of 0.197mm or a shade under 8 thou.




I suppose that because I couldn't discern a difference between 115 and 150mm arcs that would surely mean that it wouldn't matter much if it was either.

If you like I can post a new one to you (cost of a stamp only, so no big deal). I have a box of 10 spares.

Thanks for the offer but not to worry at the moment - the factory just mailed and they have the engineering team on the case!

So I'll let them figure it out.

Cheers

Steve

If you put a spare cutter on a flat bed scanner and post a high res image, we could reverse engineer the radius. The flat bed sander has much less parallax error than a camera.

K01 inserts for Spiral Cutter heads - Back in stock!



Although half have already been purchased on back order!!

New order placed - this time the Byrd Shelix cutter inserts have made it on to this order.

The Felder/Hammer Silent Cutter Inserts will be on the next order . . . on that note FenceFurniture do you have a flat bed scanner you could scan one of the blade at hi res then I can easily confirm if it is a R150 (that's what the factory thinks but it would probably be best if I could confirm it)

Originally Posted by sje-tools

FWIW, they are perzackly the same boxes that my Hammer replacements came in.

Originally Posted by sje-tools

. . . on that note FenceFurniture do you have a flat bed scanner you could scan one of the blade at hi res then I can easily confirm if it is a R150 (that's what the factory thinks but it would probably be best if I could confirm it)

Will do, PM me your email addy.

Alrighty the scan did the trick - I printed a 13.8 square with a R150 edge and a scale print of the insert and put them over each other on a light surface and they line up perfectly.

So there is one thing final thing I need to check given these are pretty unique inserts - and that is the angle of the cutting edge (so a bit easier to check than the edge radius!) - the Byrd cutters are usually 30 degrees are these the same?

I can then add them to the next order - I'll have to wait till the new follow up order has been fulfilled before ordering them.

Cheers
Steve

Originally Posted by FenceFurniture

The dimensions are:
2.45mm thick
13.45mm wide (tapering back to ~11mm on the smaller face), so that means an angle of 63.5° on the cutting face.
There is a radius on the 13.45mm cutting edge

It was in my first post Steve.....

The measurements were not precise, and the smaller face is very difficult to measure - I can't do it with any accuracy whatsoever. It's likely that it is 60° (or 30° as you say).

Originally Posted by FenceFurniture

It was in my first post Steve.....

The measurements were not precise, and the smaller face is very difficult to measure - I can't do it with any accuracy whatsoever. It's likely that it is 60° (or 30° as you say).

Apologies I missed that! I would say 30° then.

Excellent! Thanks for the help - I will get these order in my next order so watch this space!

just wondering if the byrd cutters have arrived.
regards
hardwood

Originally Posted by hardwood

just wondering if the byrd cutters have arrived.
regards
hardwood

Someone can sense the arrival of carbide!!!

They sure have - arrived today they did!

I will be making them available on the website shortly - I've been some what over run with requests for the guitar fretboard radiusing router bits of late - along Facebook . . . I said I'd never have a Facebook account and I guess I have as I put it in my websites name! So if I ain't updating here (and I still intend to sponsor - just haven't had time to do the gif) then you can always drop me a message on Facebook (www.facebook.com/sje-tools)

Also coming on here has reminded me I need to order some of the Hammer/Felder inserts - as my new order is already being compiled!

Cheers

Steve

Byrd/Shelix cutterhead inserts are go - now available to order: http://www.sje-tools.com/collections...arbide-inserts

Byrd/Shelix cutterhead owners no longer need to have the price envy of the US!

Cheers

Steve