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Unimat Fretsaw set up

Query regarding upper blade holder

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Chris V23/01/2020 16:23:56
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222 forum posts
31 photos

Unimat Fretsaw No1080 arrived today, looks to be in good condition though needs a good oiling.

If anyone is familiar with these, I'm not clear how the upper blade guide locks the blade?

The part is a piece of rod with a slot cut down its length, then a VERY tight piece of tube at one end, also with a vertical slot. Currently both rod & tube are a very tight fit, I'm assuming they are meant to be movable against each other and should somehow clamp the fret blade in place?

Any assistance as always gratefully received!

Cheers

Chris.

Former Member23/01/2020 17:51:20

[This posting has been removed]

Chris V23/01/2020 18:40:56
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222 forum posts
31 photos

Hi Bill, thank you, I have a general assembly diagram of how the saw components fit together, but it dosen't show how this part works, or is meant to. Maybe you have some more specific info, if that the case then yes please do send it over.

Cheers

Chris.

John Purdy23/01/2020 18:50:11
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194 forum posts
61 photos

Chris

If you attachment looks like this, the rod is just a guide for the blade. The blade is not actually fastened to anything at the top but just slides in the slot in the rod which acts as a guide. The tube on the rod is fixed and serves to retain the blade in the slot. In use the rod is moved down to just clear the work and is clamped to the frame at the top with the large knurled thumb screw. It is also orientated with the slot to the front so the cutting pressure pushes the back of the blade against the slot.

dscn3233.jpgdscn3234.jpg

John

Emgee23/01/2020 18:59:03
1492 forum posts
217 photos

Chris

John Purdy has described operation perfectly, be sure to feel the cutting action in use and don't try to force the cutting speed.

Emgee

Chris V23/01/2020 19:23:59
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222 forum posts
31 photos

Thank you so much John and Emgee, yes mines like that so problem solved. I need to get some metal cutting blades now, what sort of TPI would be good for 1mm brass & copper?

Cheers

Chris.

Ian S C25/01/2020 09:10:44
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7468 forum posts
230 photos

I got an Emco Unimat SL early last year, nice wee lathe , It came with attachments including the jig saw, no blades, I looked at fret saw blades, too thin, then I looked at coping saw too wide, so I took one and ground quite a bit off the back of the blade until it seemed to fit, it works OK. It seems OK even though there is nothing supporting the top end of the blade. If the going gets tough rub the blade with a bit of candle wax, You could grind down a junour hacksaw blade. Just got to find something to use as belts for the thing, I,m using 5 mm heat join belt.

Ian S C

Former Member25/01/2020 09:40:41

[This posting has been removed]

Chris V25/01/2020 13:22:58
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222 forum posts
31 photos

Thank you Ian, and I hope you continue to recover well.

Today some fretsaw blades arrived but agree I don't think they will perform well, unless under tension. Hopefully tomorrow I will have a chance to assemble it and try it out.

I'm currently considering if I might make an upper blade clamp so the blades can be in tension.

I'm sure Ive seen belts available on eBay.

Cheers

Chris

Former Member25/01/2020 13:33:37

[This posting has been removed]

Chris V25/01/2020 13:37:53
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222 forum posts
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Oh ok thanks very much Bill.

I think when I needed some I was just glad to find they were still available but that was some while ago, before I saw the light and joined the forum!

Cheers

Chris.

Hollowpoint25/01/2020 17:23:26
330 forum posts
31 photos
Posted by 34046 on 25/01/2020 13:33:37:
Posted by Chris Vickers on 25/01/2020 13:22:58:

I'm sure Ive seen belts available on eBay.

Cheers

Chris

Currently listed on ebay at TWICE the price of Emco ones from Pro Machine Tools which is why I mentioned it.

Like for like rubber as opposed to poly.

Bill

Edited By 34046 on 25/01/2020 13:35:06

A set of 2 butyl rubber belts are £7.20 plus postage from pro machine tools.

A set of 2 polyurethane belts is £8 delivered from ebay.

Not twice the price, and polyurethane is superior quality.

Former Member25/01/2020 19:19:28

[This posting has been removed]

Former Member25/01/2020 19:20:10

[This posting has been removed]

Hollowpoint25/01/2020 21:18:49
330 forum posts
31 photos
Posted by 34046 on 25/01/2020 19:20:10:

The smaller one is the same price so £2.40 times times 2 equals £4.80 so not sure how you arrived at £7.20 ?

Bill

Edited By 34046 on 25/01/2020 19:21:09

Edited By 34046 on 25/01/2020 19:23:41

They both have Unimat SL's.

Unimat sl large belt £3.60

Unimat sl small belt £3.60

£7.20 plus postage.

Ian S C26/01/2020 11:33:50
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7468 forum posts
230 photos

There is a new (to me) machinery retailer in Christchurch NZ, that I must explore. I'm using the low ratio so it has 4 belts.

Ian S C

Former Member26/01/2020 11:43:45

[This posting has been removed]

Chris V26/01/2020 13:55:36
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222 forum posts
31 photos

Ok well I set the fretsaw up this morning and was pleasantly surprised with how it works.

Cut 1mm copper and 1.5mm brass without much problem.

Unimat Fretsaw

Only issue I can see is if as suggested the top guide is lowered down to just clear of the work being cut, to act as both a hold down and blade support you cannot see where you are cutting. So that's something to think about..and any ideas are welcome.

Cheers

Chris.

John Purdy26/01/2020 17:48:10
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194 forum posts
61 photos

Chris

When I use mine I set the blade guide 1/16 - 1/8" above the work. This provides good support to the blade but allows you to see what's going on. It's not actually used as a work hold down (that's the job of your fingers!).

John

Chris V26/01/2020 18:49:53
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222 forum posts
31 photos

Ah thank you John ok I will try that, seems like I was over thinking it

Not like me at all🤔😊

Cheers

Chris.

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