Thread: 1" or 25mm slitting saws.

1" or 25mm horizontal slitting saws etc. What is more common or easier to source? Considering changing to 25mm on the Hercus when it comes time to putting it back together. Will take a little work, but I have a 25mm 3MT test bar 25mm diameter, that I think I can modify to make a new horizontal arbor. Original arbor is ok but a little tatty looking from slight corrosion from lying around. Have cleaned it up.

Hi Nev, Guys,

The only saw blades that I've seen in those sizes are the Dremal style ones, in a pack of five from China !

Since the 75 mm plunge saws have become popular I taken to buying the packs of three blades that they use. They are all 1.2 mm thick and have a TCT, and two Diamond coated ones in a pack for £2.99 here in the UK. I got another pack recently from Lidl when they were selling the plunge saws.

Sorry Baron. I think I confused you. I was referring to the bore of the blades for horizontal mill. Should have mentioned this.

Why butcher your test bar? Just grab a 3MT blank arbor. https://www.lprtoolmakers.com.au/bla...eaded-or-tang/

edit: horizontal mill. I guess the arbor needs to be long?

Originally Posted by jack620

Why butcher your test bar? Just grab a 3MT blank arbor. https://www.lprtoolmakers.com.au/bla...eaded-or-tang/

It's the full length arbor not the short ones. Can't buy an arbor with 3MT to suit the Hercus in either metric or imperial.

Originally Posted by SurfinNev

Sorry Baron. I think I confused you. I was referring to the bore of the blades for horizontal mill. Should have mentioned this.

Ah ! Thanks for the clarification.
I went and took pictures of the blades that I thought you meant. Anyway their pictures are here now

12-12-2021-002.jpg 12-12-2021-001.JPG

The first picture has the large blade removed, it was in use but I can't put my hand on it at the moment. The other picture is the pack of three blades that I bought a couple of weeks ago. I thought that they were 75 mm but it seems that they are 80 mm diameter.

Originally Posted by SurfinNev

It's the full length arbor not the short ones. Can't buy an arbor with 3MT to suit the Hercus in either metric or imperial.

Hi Nev, Guys,

ARC Euro do MT3 blank end arbours ! The blank end is soft so you could drill and thread a 1" bar into the end and they have an M12 drawbar thread in the other end.

Originally Posted by BaronJ

ARC Euro do MT3 blank end arbours !

That's what I linked to John (from a seller in Melbourne).

Have you considered making your own, that way you could have what ever diameter you need?

You could even make numerous arbors and interchange them in a Weldon style holder that can be purchased if desired.

I have a large number of 1" bored slitting saws that I bought with a batch of cutters at a clearing sale. It is a problem with horizontal milling, finding the cutters you need with the bore for the arbor you have. Would be handy to have 25mm, 1" and 1.25" arbors to make use of the cutters that come up on ebay etc. The chicom stuff seems mostly to be 25mm. Obtaining arbors in various sizes for HZ milling is not a cheap proposition as you have to have all the spacers to suit.

You would just make your own to suit.

You would just make your own to suit.

It's not hard to do. I have made several. But there is a little catch to it.
Your chuck will not be absolutely centred with zero runout. Real life.

So if you make your arbor just by machining the end bit, you will find the slitting saw blade goes zing -zing-zing as it rotates. This will in fact work OK, provided you feed accordingly.

Instead, you should skim the arbor shaft AND the blade fitting at the end in one hit so they are as concentric as possible. A live centre at the other end (well aligned!) may help.

I have found the Chinese slitting saws work OK. It may be that they don't make them for the cheap end of the market.

Cheers
Roger

Originally Posted by jack620

Why butcher your test bar? Just grab a 3MT blank arbor. https://www.lprtoolmakers.com.au/bla...eaded-or-tang/

edit: horizontal mill. I guess the arbor needs to be long?

Hi Chris, thanks,

Sorry I completely missed your post !

The price looks quite good. Here they are £10 plus postage, not a lot of difference.

I thought standard metric arbor sizes were 22 & 27mm, I don't think I've ever seen a cutter with a 25mm bore.
For an ebay MOD 2 gear cutter with a 22mm bore I removed the dogs from one of these and it worked nicely:

https://www.ebay.com.au/itm/33409120...frcectupt=true

An important thing when using long horizontal arbors is to be sure the bore and faces of your spacers are perpendicular and clean.
Any error or dirt in these will cause a long arbor to bend when it's tightened up no matter how accurately it was machined.
Cheers,
Greg.

Originally Posted by kwijibo99

I thought standard metric arbor sizes were 22 & 27mm, I don't think I've ever seen a cutter with a 25mm bore.

Thanks for that. I now remember never seeing a 25mm.