CTM Midi + sanding block

[goko]

Today I tried to use my CTM Midi together with a Festool sandingblock with dustcollection. Somehow the CT Mini is complaining, no matter what I do. Ive changed the bag and cleaned the filter. After 5 seconds, the CT Mini starts complaining "beep beep beep beep". I use the small gray hose, who comes together with the sanding block.

Are these to products not meant to work together ?

 

[aloysius]

Insufficient airflow warning?  Those Kraenzle vacs really need a minimum throughput of air for cooling purposes @ higher speeds.

Perhaps you should try reducing the motor speed right down (taking current/load away from that motor) &/or introducing an air bleed from the bright green bleed-sleeve collar where the hose attaches to your block.

 

[AlexThePalex]

On the CTM model you have to set the dial on front to the apropriate hose size you're using. I don't know exactly what the smallest hose is the vac can support, but if you have dialed the vac in to its smallest setting already, then the hose of your sanding block is not supported. Can you use the hose that came with your Midi with the block?

 

[FestitaMakool]

On the CTM model you have to set the dial on front to the apropriate hose size you're using. I don't know exactly what the smallest hose is the vac can support, but if you have dialed the vac in to its smallest setting already, then the hose of your sanding block is not supported. Can you use the hose that came with your Midi with the block?

[member=61411]Michel[/member] My Festool sanding block connects to my CTL Midi (2019MY) the hose has the new tool end connector 27mm. As Alex is saying, maybe trying a larger diameter hose is the way to go?

 

[semenza]

That thin gray hose for the sanding block is definitely the way to go with the sanding block. It is 22mm hose. Even the D27 is bulky on the block. The new style hoses will be much better than the old ribbed though. The sanding blocks need a really minimal air flow to work well. I think the problem will be that not enough air will flow with the block to make the vac happy. I don't think a larger hose won't help the sanding block or the vac.

You might try a D27 or D27/32 hose or even the gray 22mm with a Y connector on the vac. Leave the Y open. It might draw enough through the open Y to make the vac chill out, and still pull just enough for the sanding block to work well.

You could probably rig up a PVC plumbing fitting for test purposes before spending on a Festool Y.

Seth

 

[AlexThePalex]

That thin gray hose for the sanding block is definitely the way to go with the sanding block.

.............

I think the problem will be that not enough air will flow with the block to make the vac happy. I don't think a larger hose won't help the sanding block or the vac.

Not familiar to our American brethren, this is about the CTM ....... the M model vac with airflow detection and a sound alarm.  In order for this to work you have to tell the vac which hose you're using by setting the dial to the right size, as the air flow depends on the size hose you're using. If I remember correctly you can choose the 50, 36 and 27 mm hoses, but not the 22. So no matter what setting, if you use the 22 mm hose, the vac will always think something's restricting the airflow and start to beep.

And it is also possible, that no matter which hose you hook up to the sanding block, that the block itself will not let enough air through, and make the alarm sound.

Call Festool customer service to hear if there's a way to make your sanding block work with your vac, and experiment with what you do have.

One of the reasons why I think the M models are utterly yuck.

 

[goko]

Thanks alot for your answers, im gonna call Festool.

 

[Distinctive Interiors]

One of the reasons why I think the M models are utterly yuck.
[/quote]

Try telling that to a HSE inspector on a UK building site Alex.....

 

[AlexThePalex]

One of the reasons why I think the M models are utterly yuck.

Try telling that to a HSE inspector on a UK building site Alex.....
[/quote]

Oh, I will, I've got no problem with that.  [tongue]

You can give him my number if you like.  [big grin]

 

[grobkuschelig]

With sanding blocks, I always try to have the „rotating opening valve“ or whatever you call it, after the sanding block. Allows you to get air into the hose and also regulate „suction“ on the block....
Might help.

 

[semenza]

That thin gray hose for the sanding block is definitely the way to go with the sanding block.

.............

I think the problem will be that not enough air will flow with the block to make the vac happy. I don't think a larger hose won't help the sanding block or the vac.

Not familiar to our American brethren, this is about the CTM ....... the M model vac with airflow detection and a sound alarm.  In order for this to work you have to tell the vac which hose you're using by setting the dial to the right size, as the air flow depends on the size hose you're using. If I remember correctly you can choose the 50, 36 and 27 mm hoses, but not the 22. So no matter what setting, if you use the 22 mm hose, the vac will always think something's restricting the airflow and start to beep.

And it is also possible, that no matter which hose you hook up to the sanding block, that the block itself will not let enough air through, and make the alarm sound.

Call Festool customer service to hear if there's a way to make your sanding block work with your vac, and experiment with what you do have.

One of the reasons why I think the M models are utterly yuck.

Does the vac detect the  hose  or the amount of air flow?  If air flow, my thinking is that you could fool the vac by allowing plenty of air to come in through the open ' Y '.  While still getting enough air for the sanding block through the  side of the ' Y ' that has hose connected.

Normally that won't work because the tool needs much more air than what would still be drawn through the hose in that arrangement. But the the sanding blocks require very little flow. 

Seth

 

[AlexThePalex]

It detects the airflow, you tell it which hose you use by turning the knob on the front panel to the right hose, and then the vac knows that for the 36 mm hose the airflow is amount X, and for the 27 it's amount Y, etc.

Your idea of an extra air inlet could probably work.

 

[FestitaMakool]

[member=61411]Michel[/member] - Is it the new Midi, or the old Midi you have?

As far as I understand the new CTM Midi reads which hose that is connected by an RFID chip on the hose connector. It can off course be adjusted manually via the touch panel, so you probably have tried... Although, there are just a couple of the hose connectors that are listed with an “R” in the description, and the 22mm hose is not one of them.
You may try calling D&D in Denmark, to see if they have experienced this with customers.

I was almost buying the CTM model myself, but was advised to go for the L model. My dealer told me that they were exactly the same, same filtration, only the M model gave an audible warning signal - to alert on a clogged filter... so as a private user, and responsible for my own actions I bought the L version. (Obviously they had had a few customers complaining about the audible alarm on the M models, which is good with HSE in mind)