Turning a rectangular plate into a circular one

[Ian S CParticipant @iansc]

You might be able to make your own tool holder, this one is for a 16 mm triangle without a hole and is made from a bit of car rear axle.

Ian S C

[JasonBModerator @jasonb]

Any of our suppliers will do more cost effective holders in no particular order Glanze (via Chronos) ARC Eurotrade, RDG, JB Cutting tools mentioned above & Greenwood at a slightly higher price. I've got holders from all these companies and they do the job. JB also do kennametal, though not sure of full spec. If shopping at MSC check out the monthy discount flyer which can be found on their site and usually has tips at reduced costs.

[JonParticipant @jon]

Glad to have been of some use Sam.

Eccentric or interupted cuts usually create havoc with the normal recommended issue tools and tips.

I aquired two Kennametal NSR2020JK3 and 2525 back in 92 when we stopped doing the Carlton joints for the Coal Board, machines junked. I wouldnt want to know the price each but the main difference to quality is the rigidity. You could look at it tis way if a cheaper tool flexes and breaks a tip at £10 thats better spent on a better tool.
One of the NSR2020 i turned down with those NBR48R K68 or square 1/4"? wide parting NB4R K68 on an ML7 like butter. Rarely use nowadays but if eccentric or intermittant its the first of the tools i reach for.

The real way of comparng tools is having a like for like cheapy such as J&L own brand and others advertising on here to the real deal. Will find its chalk and cheese having learnt the hard way over the years.
In short the cheapies flex, remember paying £55 pus vat from J&L for an internal thread cutting tool, just came out ripped or with judder marks and could actually see the flex/vibration. Had to replace said item with a quality used jobby from Kenametal, 17 years later still using almost daily and was half the price of the J&L thing never used since.
Have similar instances with cheap own brands like Glanze, tried put back in box and left to rot at £100 ish a chuck, false economy.

Just bide your time with tooling dont get sucked in and wait for a bargain from a reputable brand, it dont matter what it looks like.
Have built up my arsenal mostly this way and two companies that stand out for me are PH Horne and Ceratizit, never had a mediocre tool or tip and top of my favourites. Seco, Iscar, Arno, Kennametal, Mitsubishi, Manchester proper brand names wont dissapoint if you will get the use out of them.

[David CauntParticipant @davidcaunt67674]

I've just had to do this for my Half Beam flywheel. First cut the square as near round on the band saw.:

Then fit to lathe. Mine is Chester Conquest. Which says maximum turning is 7" ie just over 177mm. This was only possible with the guard removed.

This has taken quite sometime and still needs the finishing touches.

[Ady1Participant @ady1]

Plasma cutter

Drill 4 holes in the hole centres

Cut 4 slightly oversized discs out in 5-7 mins with a jig

 

Edited By Ady1 on 07/03/2022 19:54:57

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