In our conception, there seems to be a grammatical rule: the master-subordinate clause containing if should follow the principle of "master-general present", how can it be said: if X will do usage is actually very common?
First, in general, in a temporal adjective clause or conditional clause (if, when\before\as\while\after\till\until\ unless\as long as\ in case\if only\provided that, etc.), the predicate verb is expressed in general present tense, and the main sentence is correspondingly expressed in future tense. It can be roughly said that the principle of "the master will be present". as:
I will go out for a walk if it doesn’t rain tomorrow .
If it doesn't rain tomorrow, I'll go for a walk.
I will tell you as soon as Tom finishes his work.
I'll tell you as soon as Tom finishes his work. (temporal adjective clauses)
I’ll show you around the city if I am free tomorrow .
If I'm free tomorrow I'll show you around. (conditional clause)
However, when will means "willing" or expresses a polite request, it can be used in conditional clauses, see:
If you will allow me ,I will see you home.
If you'll let me send it, I'll send you home. English Faq Dictionary
If you won’t help us, all our plans will ruined.
If you are not willing to help us, then all our plans will be in vain.
If you'll help me, we can finish early.
If he will pay, I’ll go with him.
If he's willing to pay, I'll go with him.
If he’ll come tomorrow , I’ll tell him about it.
If he is willing to come tomorrow, I will tell him about it.
If you will wait a moment , I’ll see if Mr. Jones is free.
Please wait a moment, I'll see if Mr. Jones is available.
If you will undertake the affair, I shall be very grateful.
I would appreciate it if you would take on this.
The Great Dictionary of Chinese and English
If he will help us, so much the better.
It would have been nice if he would have helped us.
If you will bear with me a little longer, I'll answer your question.
If you can be patient and listen to me finish, I will answer your questions.
Oxford Advanced English-Chinese Dictionary
If you will sit down for a few moments, I'll tell the manager you're here.
Please sit down, I will tell the manager that you are coming.
If you will just sign here, we will arrange for your bank to deduct your payments automatically .
Please sign here and we will contact your bank to automatically deduct your payment.
Collins Advanced English-Chinese Dual-Solution Learning Dictionary
If the market will not buy the shares, the underwriter buys them
If no one in the market buys these stocks, the underwriters will buy them.
Come, if you will.
Here you go!
Some of the above example sentences can be said in general, but they lose the meaning of will or request.
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